How to Fix a Lisp: Exercises, Therapy & Expert Steps

Think about a word you say dozens of times everyday.

"Sorry" "Thanks" "Yes" "My Bad" "I apologise." "Seriously"

Most of these words carry an "S" or a "Z" sound. For many people, these sounds are produced automatically, without a second thought. But, for someone with a lisp, there's a slight pause before speaking. A word was swapped entirely just to avoid the "S" sound.

A moment of hesitation before a presentation, a job interview, or perhaps a first date.

And God forbid if you have an "S" sound in your name, it's a nightmare.

Drew Barrymore built an entire television career with a lisp. Most people didn't notice. You did And you are here to fix it, you know how much courage it takes for people to come to this stage? Not a lot! But you did, I am rooting for you.

Already know you have a lisp and just want the fix? Jump straight to How to fix a lisp section.

Today, I have covered what type of lisp you have, what's causing it, which treatment approaches have evidence behind them and the exact home exercises that create effective change.

Not sure whether you have a lisp? Take the two-minute lisp self-assessment on Top Speech Health before reading further; knowing your starting point makes everything that follows more useful.

A lisp is a speech articulation disorder. In speech language pathology, it is stated as an articulation disorder, meaning the error is in the physical production of sound and not in the underlying sound system.

Mostly, when the tongue placement is wrong, the sound changes and comes out incorrectly. That is why lisps, particularly the frontal type, are among the most correctable speech disorders in clinical practice (Bernthal, Bankson & Flipsen, 2017).

I bet you didn't know that there are four types of lisp. Each type is caused by a different tongue-position error and needs a targeted correction approach.

Starting with the wrong exercises wastes time.

Interdental Lisp (Frontal Lisp): The tongue sticks out visibly between the upper and lower front teeth while the production of "S" and "Z", producing a "th" substitution.

"Mouse" becomes "Mouth." This is the most common type and the most correctable.

Developmentally normal before age 4.5–5; after that, it requires targeted work (McLeod & Crowe, 2018).

Dentalized Lisp: The tongue presses against the back of the upper front teeth without sticking out. The result is a flat, muffled "S". Less visible than the frontal type, but still affects clarity.

Lateral Lisp: Air escapes over the sides of the tongue rather than centrally, producing a wet, slushy sound. This type does not resolve on its own and almost always requires professional SLP involvement.

Palatal Lisp: The mid-section of the tongue contacts the hard palate on sibilant sounds. Muffled and slushy. The least common of the four requires assessment before treatment begins.

Not sure which type you have? The Top Speech lisp test identifies your type in under two minutes, the most important first step before starting any exercise programme.

The most common causes are:

Tongue thrust: The tongue pushes forward between the teeth during speech or swallowing. This is the most frequent functional driver of a frontal lisp and often requires orofacial myofunctional therapy (OMT) alongside articulation work for full resolution.

Dental alignment: An open bite, overbite, or narrow dental arch makes it physically difficult to direct airflow centrally for the "S" sound. When teeth don't close enough, the tongue fills the gap.

Tongue tie (ankyloglossia): Restricted lingual frenulum (the small tissue under the tongue) limits the required tongue movement for "S." Moderate to severe cases often benefit from assessment by an ENT or oral surgeon alongside speech therapy.

Prolonged oral habits: Pacifier use or thumb-sucking beyond age 3 is associated with tongue-forward posture and the dental changes that influence children to frontal lisps (Moimaz et al., 2014, BMC Oral Health; view study).

Learned motor pattern: In many adults, there is no structural cause at all. The brain built an incorrect motor pattern for "S" and "Z" in early childhood; repetition across decades made it automatic, and awareness alone cannot change it. Systematic training is the only key.

For a deeper breakdown: What causes a lisp | What causes a lisp in adults

Toddlers (1–3): "S" and "Z" errors are entirely normal. No intervention needed.

Preschoolers (3–5): A frontal lisp at 3–4 is within the developmental window. By age 4.5–5, "S" and "Z" should be emerging correctly in most children (McLeod & Crowe, 2018). Persistent lisp at age 5 warrants an SLP referral.

School-age (6+): A lisp that persists past age 6 will not resolve on its own. At this stage, it begins affecting phonemic awareness, reading accuracy, and peer confidence (McCormack et al., 2009, International Journal of Speech-Language Pathology; view study). Intervention is recommended without delay.

Adolescents and adults: The lisp will not self-correct. Adults often progress faster than children in therapy; higher motivation, stronger self-monitoring, and faster cognitive processing.

Reading this as an adult? You're not too late. Adults correct lisps faster than children — higher motivation, sharper self-awareness, faster cognitive processing. The window didn't close. It just got quieter.

Most adults with a frontal lisp who practise daily see measurable improvement within 6–10 weeks.

→ Seek professional help immediately if a lisp appears suddenly in an adult with no prior history. A sudden-onset lisp can indicate neurological changes that require medical evaluation first.

Evidence-Based Approaches

Traditional Articulation Therapy: The SLP establishes the correct "S" at the isolation level, then moves systematically through syllables, words, sentences, and conversation. Each level is mastered before the next begins. This Van Riper hierarchy has the strongest and most consistent evidence base for all lisp types (Bernthal, Bankson & Flipsen, 2017).

Minimal Pairs Therapy: Practising word pairs that differ only in the target sound ("sun/thun," "sea/thee") builds phonemic awareness alongside motor accuracy. Particularly effective for children who don't yet perceive their own errors (Weiner, 1981, Journal of Speech and Hearing Disorders; view study).

Orofacial Myofunctional Therapy (OMT): For lisps driven by tongue thrust, OMT retrains resting tongue position and swallowing pattern alongside speech correction. Without addressing the underlying habit, articulation therapy alone has higher relapse rates.

Biofeedback Tools: Electropalatography (EPG) provides real-time visual feedback of tongue-palate contact during speech, accelerating acquisition for persistent cases that haven't responded to traditional therapy (McAllister Byun & Hitchcock, 2012, American Journal of Speech-Language Pathology).

The easier way to do all of this

Knowing the exercises is one thing. Doing them correctly, consistently is another.

There are structured lisp programmes that help you with the exercises, track your progress, and tell you when to move forward.

One of them is the Lisp Speech Clinic by TopSpeech Health, built around the same evidence-based approach described above, designed for both self-guided practice and alongside therapy.

How Long Does It Take?

The single factor that shortens every timeline: consistent daily home practice. Sessions teach the pattern. Home practice is where it takes hold.

Top Speech Health's Lisp Speech Clinic delivers structured practice sequences and progress tracking for between-session work and standalone home programmes.

Aim for 15–20 minutes of deliberate practice daily. Work through in order. Do not skip ahead, the early exercises build the sensory awareness that makes the harder ones possible.

1. The Mirror Technique: Build Awareness First

Sit in front of a mirror. Say "s" slowly and watch your tongue. If any part of it sticks out between your teeth, that is the lisp showing up in real time.

Your goal: produce "S" sound with the tongue tip on or just behind the alveolar ridge: the hard, bumpy ridge behind your upper front teeth, with nothing visible between the teeth.

Three minutes before any other exercise. This is not about correct repetitions yet. It is about training your visual self-monitoring so you can feel the difference between right and wrong.

2. The Long T Method: The Most Effective Starting Point

Say "t" deliberately. Notice where your tongue tip lands: on the alveolar ridge, just behind the upper front teeth. That is also the correct place of articulation for "S". Now hold your tongue in that "t" position and slowly release it into a sustained "sss."

Keep the tip anchored near the ridge as the sound flows. Do not let it drift forward.

This is the single most effective exercise for frontal and dentalized lisp correction. The "t" gives the tongue a physical landmark it already knows how to find. Twenty repetitions, rest 30 seconds, repeat. Three sets per session.

3. The Straw Technique

Place a thin coffee stirrer or a pen lightly between your front teeth. Say "s" through the straw/pen. The object blocks the tongue from sticking out and channels airflow centrally, exactly where it needs to go for "S".

Ten productions with the object in it. Remove it. Ten productions immediately after, holding the same airflow direction. The transition is the exercise.

You are teaching the tongue to replicate the correct pattern without the physical guide.

4. Syllable Drills: Bridge Into Real Words

Once you can produce "S" consistently in isolation, add a vowel: "see — say — soo — sigh — so." Five repetitions of each.

Then reverse: "ees — ays — oos." Do not rush this step. Inconsistent syllable performance predicts inconsistent performance at every harder level that follows.

5. Word and Sentence Drills — Build the Pattern

Progress through word groups in order:

Then sentences:

Record yourself. Listen back. What you hear on playback and what you feel during production often don't match in the early weeks. The recording is ground truth.

6. Conversation Transfer: The Final Step

Read aloud from any book or article for 10–15 minutes daily. Then designate one conversation per day where you actively monitor your "S" sounds just one, deliberately manageable. This is the hardest step: carrying a new motor pattern into automatic, unmonitored speech. Build the habit slowly, then expand it.

Track progress weekly with the Top Speech lisp test.

Here's what nobody tells you about fixing a lisp, and why most people quietly give up three weeks in.

Most people who try to fix a lisp drill correct productions in practice, feel confident, then lose the pattern the moment they enter a real conversation. This feels like failure but trust me it's not.

It is a tendency of how motor learning works.

A new motor pattern in speech, sport, or music is initially context-dependent. It works where you practised it.

When the context changes (real conversation, stress, speaking quickly), the old automatic pattern reasserts itself because the new one isn't automatic yet.

The solution is not more isolated drilling. It is deliberate practice in increasingly varied contexts: sounds to syllables to words to sentences to reading aloud to monitored conversation to unmonitored conversation. Each step is harder. Each step is necessary. Skipping ahead produces the illusion of correction without the generalisation that makes it permanent.

Some people notice their lisp worsens when tired or stressed. Motor patterns that aren't yet automatic break down under cognitive load, the same reason any new skill needs to be practised until it becomes second nature. That is not regression. That is the process working exactly as it should.

Conclusion

The gap between "I have a lisp" and "I used to have a lisp" is smaller than most people think. It's not talent. It's not therapy three times a week. It's knowing what you're fixing and practising it daily until the new pattern becomes the automatic one.

Step one is knowing what you're fixing.

Understanding the problem

• Lisp Self-Assessment — Find out in two minutes whether you have a lisp, which type, and which sounds are affected
• What Causes a Lisp — The full picture of anatomical, developmental, and habitual causes
• What Causes a Lisp in Adults — Why unresolved childhood lisps persist into adulthood

Practice and treatment

• Lisp Test in 2 Minutes — Use weekly as a progress benchmark while working through these exercises
• How to Fix an S Lisp — Detailed drill sequences for the "S" phoneme across all word positions

Related speech challenges

• Rhotacism — Difficulty with the "R" sound: causes, types, and evidence-based correction
• R Speech Impediment — For parents and adults navigating "R" errors