Do I Have a Lisp? A Two-Minute Self-Check for Teens and Adults

The short answer: check in two minutes, confirm with an SLP

If you’re 13 or older, your S and Z are past the age when they’re expected to be settled. A review of 15 studies covering 18,907 U.S. children found that all fricatives, the sound family S and Z belong to, were acquired by 6;11 at the strict 90% criterion. A consistent S or Z that sounds different now isn’t “still developing.” Speech researchers describe sound errors still present after the end of the developmental period, around age 9, as residual or persistent errors.^5,7

Whether you’d call it a lisp is a separate question, and estimates vary widely. In one study, 748 Dutch-speaking university students were video-recorded reading a passage aloud, and analysis of the recordings found lisping in 23.3% of them. That figure comes from one language and one student group. Estimates of residual speech errors for any sound are much lower: about 1–2% of young adults in one review, and 2–5% of speakers in another estimate.^6,7,8

A self-check can tell you whether your S might be worth a closer listen. Only a licensed speech-language pathologist (SLP) can tell you whether it’s a speech sound disorder and what kind. An SLP’s assessment can include an examination of how your lips, jaw and tongue work, and a check of how the sound holds up from single words to connected speech.¹

A two-minute self-check you can do privately

This is not a validated test. It’s a structured way to listen to yourself, built around what speech-language pathologists pay attention to: where your tongue sits, where the air goes, and whether the sound stays the same from single words to everyday talk.^1,17

1. 1Record. Hold your phone about 8–12 inches from your mouth in a quiet room. Say four words: sun, messy, bus, zoo. Then read one sentence packed with S sounds, then talk naturally for about 20 seconds.
2. 2Listen back. Does your S sound like “th,” muffled, wet or slushy, “sh”-like, or whistly? Does it sound the same in single words as in natural talk?
3. 3Use a mirror. Say a long “sssss,” then “sun,” slowly. If your tongue tip shows between your front teeth, that fits a frontal pattern. If you can’t see it, a dentalized pattern is still possible.
4. 4Notice the airflow. Does air or wetness seem to spill out at the sides of your mouth instead of straight out the front? That matches how a lateral lisp is described.
5. 5Run the free lisp check further down this page: it listens to your S in three short words.

The mirror step has a limit. With a dentalized lisp, the tongue presses against the back of the upper front teeth rather than poking between them, so it can be hard to see.¹⁷

How to read your results: if your S sounded and looked clear at every step, that’s reassuring. If something stood out, treat it as a reason for a closer listen, not a label. Telling a speech sound disorder apart from normal variation or accent takes a professional assessment.¹

• More S and Z words to try

How each lisp type sounds and feels

Lisps are usually described by where the tongue goes and where the air escapes. The table sums up how clinical teaching sources describe the four common patterns, plus what one study found in young adults.^17,18,19,6

These descriptions come mainly from clinical teaching and practice sources. We didn’t find an ASHA page that sets out all four subtypes, though ASHA does give “a lateral /s/” as an example of a distortion seen in speech sound disorders. That a palatal lisp is never typical rests on lower-tier clinical sources only. Treat the table as a plain-language guide, not diagnostic criteria.^19,18,17,1

Lateral lisp: the one not to sit on

A lateral lisp sends air over the sides of the tongue, which gives a slushy sound. Clinical sources describe it as not a typical developmental error and say it rarely corrects itself without therapy. If your S sounds wet or slushy, an SLP assessment is a reasonable next step, whatever your age.^19,17

• Lateral lisp: the slushy S explained

What about a whistling S?

Some people notice a high-pitched, whistly S. The standard four-type descriptions of lisps don’t include a whistling S. We found only one blog description of it and no research on how common it is. The evidence here is weak: treat “whistling S” as a description of what you hear, not an established lisp type.^17,18

What isn’t a lisp: accent, dialect and normal variation

An accent is not a lisp. ASHA notes that we all speak with an accent. Its guidance also states that when a child uses more than one language or dialect, the rules of one may influence speech in the other, and that these influences do not indicate a speech sound disorder. If your S sounds different because of the language you grew up with, that’s a difference, not an error.¹

Researchers also study lisping from a sociolinguistic angle, looking at how the way we speak helps build identity. One review argues for a framework that acknowledges adults who self-identify as lisping, rather than seeing them only through a disorder lens.¹³

Common, and not always a problem

A lisp is more common than many people assume. In the study of Dutch-speaking students that found 23.3%, there was no significant difference between women and men. The study’s authors left open whether this reflected a recent trend or whether lingering lisps are simply fairly normal.⁶

Research on how listeners judge a lisp is old and small. In a 1978 study, adult listeners rated male speakers with a frontal lisp lower than non-lispers on all five traits measured, including intelligence and speaking ability. A 1976 study found that a simulated lateral lisp drew adverse attention to the speaker. Neither settles how people with a lisp are seen today.^10,11

Adults who lisp describe a range of experiences. In interviews with seven adults who identify as having a lisp, some experienced stigma from others, some felt it internally, and the experiences varied. A 2020 review discusses lisping as a “minor bodily stigma” and argues for acknowledging adults who self-identify as lisping. Whether to work on a lisp is a personal choice.^12,13

What a free online lisp check can and can’t tell you

An online check can listen to recorded S and Z sounds. It can’t see how your tongue moves or tell an accent feature from a distortion, both of which are part of a professional assessment. We found no published research on how accurate consumer online lisp checks are, ours included. Treat any result as a prompt to listen more closely, not a verdict.¹

• It can: give you a quick, private first listen and help you decide whether a closer look is worthwhile.
• It can’t: diagnose a lisp, name a lisp type, rule out an accent difference, or replace an SLP.
• SpeechStep’s free check is a preliminary screen of your S (three short words). It never names a lisp type and is not a diagnosis.

When a teen or adult lisp is worth an SLP assessment

Some residual errors still fade in the teen years. One review suggests up to 75% resolve between about age 9 and the end of high school. That figure covers residual errors of all sounds, not lisps specifically, and it can’t predict what will happen for any one person. It isn’t a reason to wait if your S bothers you.⁷

Lateral and palatal patterns are a different story. Clinical sources describe them as not part of typical development and say they rarely fade on their own, unlike a frontal lisp, which often does in young children.^19,18,17

• Your S sounds wet, slushy or “sh”-like.
• People often ask you to repeat yourself, or you avoid certain words or situations.
• It affects your work, school, confidence or social life.
• It started or changed after dental work, braces, an injury or a medical change. A sudden change needs a professional, possibly a dentist or doctor as well as an SLP.
• You’re a teen, the lisp hasn’t faded, and it bothers you.

In surveys, residual speech errors can matter in daily life. The Royal College of Speech and Language Therapists says speech sound disorders can last into adulthood and affect employment and mental health. In one survey of 80 Brazilian Portuguese-speaking adults with residual S and/or R distortions, only a small number reported negative reactions to their speech and a minority felt it interfered with work or social life, but many felt their speech was different and felt insecure in speaking situations.^4,14

How to find someone

In the U.S., ASHA’s ProFind directory lists ASHA-certified SLPs who are accepting referrals. In the UK, adults may be able to get speech and language therapy on the NHS, or privately through ASLTIP. NHS access varies by area. Gloucestershire’s adult service welcomes self-referrals for most difficulties, regardless of age, while an adult service in Hounslow, West London, which focuses on neurological and voice conditions, takes referrals only through a GP.^3,4,15,16

A note on causes and exercises

ASHA lists distorted S and Z, often an interdental lisp, as a possible sign of orofacial myofunctional disorders such as tongue thrust. ASHA also notes that SLPs are cautious about using orofacial myofunctional therapy, which uses tongue and lip exercises, on its own to treat speech errors. Working out the cause for any one person takes a professional assessment.²

Treatment for residual speech errors in teens and adults exists, but the research on S is thin. A review of this treatment research found 30 articles, and 90% of them involved R. Across approaches, more intensive schedules tended to work better.⁹

• Lisp in adults: is it too late to work on it?
• Free lisp test: a quick listen to your S sound
• Lateral lisp: why the slushy S is different

Frequently asked questions

References

19 sources from authoritative bodies. Last reviewed October 2026.

1. 1.ASHASpeech Sound Disorders: Articulation and Phonology — Practice Portal page, 2026.
2. 2.ASHAOrofacial Myofunctional Disorders — Practice Portal page, 2026.
3. 3.ASHAASHA ProFind: Find Certified Audiologists and Speech-Language Pathologists — Directory page, 2026.
4. 4.Royal College of Speech and Language TherapistsSpeech sound disorders – overview — Professional body clinical information (last updated 2024), 2024.
5. 5.Peer-reviewedCrowe & McLeod — Children’s English Consonant Acquisition in the United States: A Review — Peer-reviewed review, 2020.
6. 6.Peer-reviewedVan Borsel, Van Rentergem & Verhaeghe — The prevalence of lisping in young adults — Peer-reviewed prevalence study, 2007.
7. 7.Peer-reviewedFlipsen — Emergence and Prevalence of Persistent and Residual Speech Errors — Literature review, 2015.
8. 8.Peer-reviewedMcAllister, Preston, Hitchcock & Hill — Protocol for Correcting Residual Errors with Spectral, ULtrasound, Traditional Speech therapy Randomized Controlled Trial (C-RESULTS RCT) — Peer-reviewed trial protocol, 2020.
9. 9.Peer-reviewedShields & Hopf — Intervention for residual speech errors in adolescents and adults: A systematised review — Systematised review, 2023.
10. 10.Peer-reviewedMowrer, Wahl & Doolan — Effect of Lisping on Audience Evaluation of Male Speakers — Peer-reviewed study, 1978.
11. 11.Peer-reviewedSilverman — Listeners’ impressions of speakers with lateral lisps — Peer-reviewed study, 1976.
12. 12.Peer-reviewedLockenvitz, Oxley & Tetnowski — The experience of stigma in adults who lisp — Peer-reviewed qualitative study, 2022.
13. 13.Peer-reviewedLockenvitz, Tetnowski & Oxley — The sociolinguistics of lisping: a review — Peer-reviewed review, 2020.
14. 14.Peer-reviewedVeríssimo, Van Borsel & de Britto Pereira — Residual /s/ and /r/ distortions: The perspective of the speaker — Peer-reviewed survey study, 2012.
15. 15.GovernmentAdult Speech and Language Therapy — NHS service page (Gloucestershire Health and Care NHS Foundation Trust), 2026.
16. 16.GovernmentSpeech and language therapy (adults) — NHS service page (West London NHS Trust, Hounslow), 2026.
17. 17.speechpathology.orgLisping: Understanding the 4 Types, Causes & How SLPs Correct Them — Professional-information article (lower tier), 2026.
18. 18.California Scottish Rite Foundation (CASRF, nonprofit)The 4 Types of Lisps Explained — Nonprofit blog (lower tier), 2026.
19. 19.Speech Therapy PDWhat is a Lateral Lisp? (glossary) — SLP continuing-education glossary (lower tier), 2026.