Lisp in Adults: Can Speech Therapy Fix It?
Have you had a lisp since childhood and wondered whether you're simply too old to change it?
Maybe you've become more aware of your speech at work, during presentations, on video calls, or in everyday conversations. You may even have tried to correct the way you pronounce /s/ or /z/ on your own without knowing exactly what to change.
The good news is that being an adult doesn't automatically mean it's too late to work on a lisp.
Adults can seek speech-language therapy for persistent speech-sound difficulties, and an SLP can help identify how a sound is being produced and develop an individualized approach to improving it. ASHA notes that speech sound difficulties that began in childhood can persist into adulthood and that assessment and intervention can still be relevant for adults.
At the same time, a lisp isn't something every adult needs to "fix." If your speech difference doesn't bother you, there is no requirement to change it. Speech therapy should be guided by your communication goals, whether those involve confidence, professional communication, clarity, or simply wanting to pronounce certain sounds differently.
What Is a Lisp?
A lisp is commonly used to describe an atypical production of the /s/ and /z/ sounds.
For example, you might notice that words containing these sounds don't sound quite the way you expect:
"sun"
"sister"
"seven"
"zoo"
"zip"
"busy"
A lisp can happen when the tongue is positioned or moves in a way that changes the direction of airflow needed to produce the target sound.
The result may be a sound that resembles "th," sounds muffled, or has a distinctive "slushy" quality.
Sounderic's existing guide to S-sound speech therapy provides additional information about /s/ production and the different types of lisps.
It's also important to distinguish a speech difference from a language or cultural difference. ASHA notes that speech sound systems vary between languages and dialects, and that differences related to a person's linguistic background should not automatically be considered a speech sound disorder.
Is It Too Late to Fix a Lisp as an Adult?
No.
Adults can seek speech therapy for a lisp even if they've had it since childhood.
A long-established speech pattern may take practice to change, but being older doesn't make speech therapy pointless. An SLP can help you learn a different tongue position and airflow pattern and then practice using the new sound consistently.
The goal isn't necessarily to make your speech sound like someone else's. Instead, therapy can help you work toward the specific communication change you want to make.
For example, you might want to:
Pronounce /s/ and /z/ more clearly.
Feel more confident when speaking.
Improve clarity during presentations.
Feel less self-conscious during conversations.
Communicate more comfortably at work.
Reduce a speech pattern you've been aware of for years.
ASHA's guidance on speech sound disorders notes that information about speech sound difficulties can be relevant to persistent difficulties in adulthood.
Do You Have to Treat a Lisp?
No.
A lisp is not automatically a problem simply because it sounds different from another person's speech.
Some adults are perfectly comfortable with their speech and don't want to change it. Others may feel that their lisp affects their confidence or makes certain situations more difficult.
The decision to pursue therapy should come from you—not from someone else telling you that your speech needs to be changed.
If you want to work on your lisp, however, an SLP can help you understand exactly what is happening and whether therapy is likely to be useful.
Why Do Some Adults Have a Lisp?
There isn't always one obvious reason why an adult has a lisp.
Some people have used the same speech pattern since childhood, while others may have factors involving tongue movement, oral structures, or dental alignment.
Possible contributors include:
A Speech Pattern Learned in Childhood
Some adults developed an unusual way of producing /s/ or /z/ when they were learning to speak and continued using that pattern as they grew older.
Once a speech pattern becomes habitual, you may not even be consciously aware of where your tongue is positioned when you speak.
Tongue Position and Movement
The tongue plays an important role in producing clear /s/ and /z/ sounds.
A small change in tongue position or the direction of airflow can change the resulting sound.
Speech therapy can help you become more aware of these movements and learn a different production pattern.
Tongue Thrust
A forward or atypical tongue posture can sometimes affect speech production.
Sounderic's article on tongue thrust discusses how tongue posture can influence sounds such as /s/ and /z/.
However, a lisp should not automatically be attributed to tongue thrust. An SLP or other appropriate professional can help determine whether tongue posture is actually relevant to your speech.
Dental or Jaw Factors
The position and structure of the teeth and jaw can influence how the tongue interacts with the mouth during speech.
That doesn't mean dental alignment is the cause of every adult lisp.
If you suspect that your teeth, jaw, or oral structure may be contributing to your speech pattern, your SLP can help determine whether another professional, such as a dentist or orthodontist, should also be involved.
Other Speech or Motor Factors
Some speech difficulties are associated with neurological, structural, or motor factors.
This is particularly important if your speech has changed recently rather than remaining essentially the same throughout your life.
A lifelong lisp and a newly developed speech change are not the same situation.
If an adult suddenly develops slurred speech, difficulty speaking, facial weakness, or other neurological symptoms, that should receive prompt medical attention rather than being assumed to be a lisp.
What Are the Different Types of Lisps?
Lisp is a broad term that can describe several different patterns.
The commonly described types include interdental, dentalized, lateral, and palatal lisps.
Interdental Lisp
An interdental lisp, sometimes called a frontal lisp, occurs when the tongue moves too far forward, often between the front teeth.
The /s/ or /z/ sound may resemble a "th" sound.
For example, "sun" may sound more like "thun."
Dentalized Lisp
With a dentalized lisp, the tongue may press against or come too close to the back of the front teeth.
Instead of the tongue visibly coming between the teeth, the altered tongue position can affect the direction of airflow and produce a muffled or altered /s/ or /z/.
Lateral Lisp
A lateral lisp occurs when air escapes over the sides of the tongue rather than being directed primarily down the center.
This can give the speech a characteristic "slushy" or wet-sounding quality.
Sounderic has a separate guide to lateral lisp that goes into greater detail about this particular speech pattern and how it is treated.
Palatal Lisp
A palatal lisp occurs when the tongue is positioned too far back toward the roof of the mouth, affecting the production of /s/ and /z/.
It is less commonly discussed than some other lisp patterns, but an SLP can identify the specific production pattern during an assessment.
How Do I Know What Type of Lisp I Have?
It can be difficult to accurately identify your own lisp just by listening to yourself.
You might notice that your /s/ sounds like "th," or that your speech sounds slightly muffled or "slushy," but identifying the exact tongue position responsible for the sound can be difficult without professional observation.
An SLP can listen to your speech and assess:
Which sounds are affected
Where the tongue is positioned
How airflow is directed
Whether the pattern occurs consistently
Whether the sound changes depending on the word or context
How the speech pattern affects overall intelligibility
The evaluation can then guide the therapy approach.
Knowing exactly what is happening is often more useful than simply knowing that you have a "lisp."
Can Speech Therapy Fix a Lisp in Adults?
Speech therapy can help adults work on persistent speech-sound difficulties, including some types of lisp.
The first step is usually understanding how you're currently producing the sound.
An SLP may then help you learn:
A more appropriate tongue position
Better control of airflow
The movements needed to produce the target sound
How to recognize an accurate versus inaccurate production
How to carry the new production into everyday speech
ASHA describes speech-sound intervention as individualized and notes that therapy may address persistent speech-sound difficulties in adulthood.
It's important to remember that "fix" doesn't have to mean an overnight or guaranteed elimination of every trace of a lisp.
The amount and speed of improvement can vary between individuals.
The goal may instead be to develop a clearer /s/ and /z/, increase consistency, or achieve the specific speech change that matters to you.
What Does Speech Therapy for an Adult Lisp
Look Like?
Speech therapy for an adult lisp is usually individualized to the way you currently produce the sound. The exact exercises and techniques can vary depending on your lisp type, the sounds affected, and your communication goals.
An SLP may begin by evaluating your speech and then work through increasingly complex speaking tasks. ASHA describes a progression that can include establishing a sound, helping it generalize to different words and situations, and maintaining the new production over time.
1. Speech and Oral-Motor Assessment
Your SLP will first listen to your speech and examine how you produce sounds such as /s/ and /z/.
They may look at:
Your tongue position during /s/ and /z/
Where the airflow is directed
Whether air escapes through the center or sides of the tongue
How your teeth and jaw relate to sound production
Whether the speech pattern occurs consistently
Which words or speaking situations are most difficult
Whether other speech sounds are affected
The assessment helps determine what needs to change rather than simply labeling the speech pattern as a lisp.
2. Learning the Correct Tongue Placement
For many adults, one of the most important parts of therapy is becoming aware of where the tongue needs to be.
You may have produced your /s/ sound the same way for years without consciously thinking about your tongue.
Your SLP may teach you how to:
Position the tongue appropriately
Keep the tongue from coming too far forward
Create the appropriate narrow channel for airflow
Direct air through the center of the mouth
Coordinate tongue position with airflow
Recognize what an accurate /s/ or /z/ feels and sounds like
The exact placement isn't identical for every speaker, so it's better to work with an SLP than to assume that one tongue position will work for everyone.
3. Practicing the Target Sound
Once you understand the desired production, you may practice the sound on its own.
For example, therapy might progress from:
Sound → syllables → words → phrases → sentences → conversation
This gradual progression allows you to build control before trying to use the new production during spontaneous conversation. ASHA describes this type of progression as part of speech-sound intervention, along with later generalization and maintenance.
4. Moving Into Everyday Speech
Producing a clear /s/ while concentrating on your tongue position is one thing.
Using it automatically while you're:
Talking with a friend
Participating in a meeting
Giving a presentation
Ordering food
Speaking on the phone
Answering questions
Having a fast-paced conversation can be much harder.
That's why therapy doesn't necessarily stop once you can produce the sound correctly in an exercise.
The next goal is carryover—using the new speech pattern naturally in real communication.
Can You Practice a Lisp at Home?
Yes, home practice can be an important part of speech therapy, particularly when it reinforces techniques you've learned from your SLP.
However, repeatedly practicing a sound incorrectly can also reinforce the existing pattern.
That's why it can be helpful to first understand exactly what you're trying to change.
If you're working on an /s/ sound, for example, your SLP may give you specific exercises based on your tongue placement and airflow pattern.
A home practice routine might involve:
Practice 1: Awareness
Pay attention to how you currently produce /s/ and /z/.
Notice:
Where your tongue is
Where you feel the airflow
What the sound feels like
Whether the air escapes through the center or sides
Practice 2: Individual Sounds
Practice the target sound while concentrating on the new production pattern.
The objective isn't simply to repeat the sound hundreds of times. Accuracy matters more than repetition.
Practice 3: Words
Once the sound is becoming more consistent, practice it in words.
You might work with words containing the target sound at different positions:
Beginning of a word
Middle of a word
End of a word
Practice 4: Conversation
Eventually, practice using the sound during increasingly natural speech.
Reading aloud can be useful, but spontaneous conversation is particularly important because you can't consciously monitor every sound forever.
The ultimate goal is for the new production to become increasingly automatic.
How Long Does It Take to Correct an Adult Lisp?
There isn't a single number of sessions that applies to every adult.
The timeline depends on the individual.
Factors that may influence progress include:
The type of lisp
How long you've used the speech pattern
Which sounds are affected
Your ability to establish the new sound
How consistently you practice
How easily the new production carries over into conversation
Whether other speech or oral factors are involved
Your specific communication goals
Someone who can quickly learn the new tongue position but struggles with conversational carryover may have different therapy needs from someone who has difficulty establishing the sound in the first place.
Rather than promising that an adult lisp will disappear within a specific number of weeks, a better approach is to evaluate progress based on increasingly consistent and functional speech production.
When Should an Adult See an SLP for a Lisp?
You don't have to wait until a lisp causes a major problem before seeking help.
Consider speaking with an SLP if:
You've had a lisp for years and want to change it.
You feel self-conscious about your speech.
Your lisp affects your confidence at work or socially.
You have difficulty producing /s/ or /z/ clearly.
People frequently comment on or misunderstand a particular sound.
You want to improve your pronunciation for professional communication.
You've tried exercises online but aren't sure whether you're practicing correctly.
You want to understand exactly what is causing your speech pattern.
You can learn more about adult speech therapy with Sounderic if you're considering an evaluation or treatment.
What If My Lisp Doesn't Bother Me?
Then you don't necessarily need therapy.
Speech therapy is not about making everyone sound the same.
Adults have different accents, dialects, voices, and speech patterns. A difference in pronunciation isn't automatically a disorder.
If your lisp is simply a feature of your speech and you're comfortable with it, there may be no reason to change it.
Therapy becomes relevant when you want to make a change or when a speech difficulty is interfering with communication.
Does a Lisp Mean Something Is Wrong With My Tongue?
Not necessarily.
Having a lisp doesn't automatically mean that your tongue is abnormal or that there is something physically wrong with it.
A lisp can involve a learned speech-production pattern, including how the tongue is positioned and how airflow is controlled.
Some people may also have contributing oral, dental, or structural factors, but these aren't present in every case.
That's why an individualized assessment is useful.
Instead of assuming that your tongue is "wrong," an SLP can evaluate how your tongue, jaw, teeth, and airflow work together during speech.
Lisp vs. Accent or Language Difference
It's important not to confuse a lisp with an accent or a pronunciation pattern associated with a person's language or dialect.
People who speak multiple languages may use different sounds or sound patterns depending on the language they're speaking. Regional dialects can also have legitimate differences in pronunciation.
ASHA emphasizes that clinicians should consider linguistic and cultural differences when evaluating speech sound production rather than automatically treating language or dialect differences as disorders.
In other words, sounding different from a particular variety of English doesn't automatically mean you need speech therapy.
If you're concerned about a specific /s/ or /z/ production, an SLP can help determine whether you're dealing with a speech-sound difficulty or simply a normal feature of your linguistic background.
What If I Have Had My Lisp Since Childhood?
Having a lisp since childhood doesn't mean you missed your opportunity to work on it.
Some speech sound difficulties that begin during childhood can persist into adulthood. ASHA specifically notes that information about speech sound disorders can be relevant to persistent difficulties in adults.
You may simply have developed a speech pattern that became highly practiced over many years.
That can make changing it a process of learning a new movement pattern and making it automatic, rather than simply being told how the sound "should" be pronounced.
This is one reason professional guidance can be helpful: you aren't just trying to remember to "say your S correctly." You're learning how to produce the sound differently and then use that production naturally.
Can an Adult Lisp Be Improved Without Speech Therapy?
Some adults experiment with changing their speech on their own, and increased awareness may help in some situations.
However, it can be difficult to identify the underlying production pattern without professional assessment.
For example, two people may both describe their speech as a "lisp," while one has a frontal/interdental pattern and another has a lateral airflow pattern. The strategies that help them may therefore be different.
Speech therapy provides:
An individualized assessment
Feedback on your actual speech production
Specific placement guidance
Structured practice
Progression from simple sounds toward conversation
Help with carryover into everyday communication
If you've been trying to change your speech on your own and aren't making progress, working with an SLP may give you a clearer starting point.
Myth vs. Fact: Adult Lisps
Myth: "I'm an adult, so it's too late."
Fact: Adults can work on persistent speech-sound difficulties. Age alone doesn't make speech therapy inappropriate.
Myth: "If I've had a lisp since childhood, nothing can change."
Fact: A long-standing speech pattern may be changed through structured practice and individualized therapy, although results and timelines vary.
Myth: "Everyone with a lisp has a tongue problem."
Fact: Lisps can have different contributing factors, and a lisp doesn't automatically mean there is a structural problem with the tongue.
Myth: "I need to eliminate my accent before treating my lisp."
Fact: Accents and dialects are not inherently speech disorders. An SLP should consider your linguistic background when evaluating your speech.
Myth: "I just need to practice saying S repeatedly."
Fact: Repetition alone isn't necessarily enough. The quality of tongue placement, airflow, feedback, and progression toward natural conversation all matter.
Myth: "Speech therapy should make me sound like everyone else."
Fact: The goal of therapy should be based on your communication goals, not on forcing everyone into one way of speaking.
When a New Lisp Appears Suddenly
A lifelong lisp is very different from a new speech change that appears during adulthood.
If you've always pronounced /s/ differently, that may simply represent a longstanding speech pattern.
But if your speech suddenly becomes slurred, unclear, or noticeably different—especially if this occurs along with facial weakness, numbness, confusion, difficulty understanding speech, severe headache, or weakness in an arm or leg—don't assume that you've suddenly developed a lisp.
Seek urgent medical attention for sudden changes in speech.
An SLP can be an important part of evaluating and treating many communication difficulties, but a sudden neurological change requires appropriate medical assessment.
How Can Sounderic Help With an Adult Lisp?
If you've lived with a lisp for years and are ready to work on it, you don't have to figure everything out by yourself.
Sounderic provides adult speech therapy with individualized assessment and intervention for a range of communication concerns.
For an adult who wants to work specifically on a lisp, therapy can focus on understanding your current speech pattern, identifying the sounds you want to improve, learning appropriate tongue placement and airflow, and gradually carrying the new production into everyday conversation.
What Can Adult Lisp Therapy Focus On?
Depending on your assessment and goals, therapy may focus on:
Identifying the specific type of lisp or speech-sound pattern
Understanding tongue placement during /s/ and /z/
Improving airflow control
Establishing a more accurate sound production
Practicing sounds in increasingly complex words and sentences
Improving consistency during conversation
Developing self-monitoring skills
Building confidence in everyday or professional communication
If you're interested in the mechanics of /s/ production, Sounderic's guide to S-sound speech therapy provides a more detailed look at the sound and common difficulties associated with it.
You can also learn more about what a lisp is, its different types, and treatment approaches.
Online Speech Therapy for Adults
For many adults, online therapy can make it easier to fit speech practice into a busy schedule.
Sounderic provides online speech therapy for adults, including assessment and individualized intervention.
The important part isn't whether therapy happens online or in person. What matters is having an appropriately trained speech-language pathologist who can assess your communication concern and develop an approach suited to your needs.
Frequently Asked Questions About Lisps in Adults
Is it too late to fix a lisp as an adult?
No. It is not automatically too late to work on a lisp as an adult. Persistent speech-sound difficulties can continue into adulthood, and speech therapy can be appropriate for adults who want to change a particular speech pattern.
The amount of improvement and the time required vary from person to person.
Can adults get speech therapy for a lisp?
Yes. Adults can work with a speech-language pathologist on persistent speech-sound difficulties, including difficulties involving /s/ and /z/.
An SLP can assess your speech, identify the production pattern, and develop an individualized treatment plan.
Can a lisp be corrected at any age?
Adults can learn and practice different speech-production patterns, but it is better to avoid promising that every lisp can be completely eliminated.
The outcome depends on factors such as the type of speech pattern, contributing factors, consistency of practice, and the individual's goals.
What causes a lisp in adults?
An adult lisp may be a speech pattern that began during childhood and persisted over time. Tongue placement, airflow, oral structures, dental factors, and other speech-production factors may also contribute.
There isn't one cause that applies to every adult with a lisp.
What are the different types of lisps?
The commonly described types include:
Interdental lisp: The tongue moves too far forward, often between the teeth.
Dentalized lisp: The tongue is positioned against or too close to the teeth during production.
Lateral lisp: Airflow escapes around the sides of the tongue.
Palatal lisp: The tongue is positioned too far back toward the palate.
The exact characteristics can vary, which is why an assessment can be useful.
How do I know what type of lisp I have?
An SLP can listen to your speech and assess your tongue placement, airflow, sound production, and speaking patterns.
Trying to identify the type yourself can be difficult because you may not be able to see or feel exactly what your tongue is doing while you speak.
Can speech therapy get rid of an adult lisp?
Speech therapy can help many adults work toward clearer or different production of the sounds affected by a lisp.
However, treatment shouldn't be presented as a guaranteed "cure." Your SLP can help establish realistic goals and track how consistently you can produce the target sound across increasingly natural speaking situations.
How long does it take to correct a lisp?
There is no universal treatment timeline.
Some adults may establish a new sound relatively quickly but need more practice to use it naturally in conversation. Others may need more time to learn the new tongue placement or airflow pattern.
Your SLP can provide a more meaningful estimate after assessing your individual speech pattern.
Can I fix my lisp at home?
Some adults may benefit from practicing speech exercises at home, particularly when those exercises have been recommended by an SLP.
However, practicing the wrong tongue position repeatedly may reinforce the existing pattern. If you're unsure what is causing your lisp, professional assessment can help you determine what you should actually be practicing.
Why did I suddenly develop a lisp as an adult?
A sudden change in speech should not automatically be considered a lisp.
If your speech has recently become unclear, slurred, or noticeably different—especially if you also have symptoms such as facial weakness, numbness, confusion, difficulty understanding speech, or weakness in an arm or leg—seek urgent medical attention.
A longstanding lisp and a sudden change in speech can have very different causes.
Does having a lisp mean I have a speech disorder?
Not necessarily.
A pronunciation difference can be part of a person's accent, dialect, or multilingual speech system. These linguistic differences should be distinguished from speech sound disorders.
If you're concerned about a particular speech sound, an SLP can evaluate it in the context of your language and dialect background.
You Don't Have to Live With a Lisp Just Because You're an
Adult
If you've had a lisp since childhood, you may have assumed that changing it is no longer possible.
That's not necessarily true.
Adults can seek professional help for persistent speech-sound difficulties, and an individualized speech therapy program can help you understand how you're producing a sound, learn a different production pattern, and practice using it more naturally in everyday communication.
At the same time, you don't have to change your speech simply because someone else thinks you should. Your accent, dialect, voice, and individual communication style are part of your identity.
If changing your lisp is something you want, however, there is no reason to assume that adulthood means you've missed your opportunity.
The first step is understanding what's happening with your speech and deciding what you want to achieve.
If you're ready to explore your options, learn more about Sounderic's adult speech therapy services and speak with a qualified speech therapist about your goals.
