How To Fix A Lisp In Adults. For this reason, some people consider a lisp “cosmetic”. Next, clench your teeth together with your tongue slightly touching the back of your teeth.
With tongue thrust, the tongue tends to push through the upper and lower front teeth when swallowing, often causing the lips to open. Children and adults who lisp can be mocked or teased by their peers. For the “th” sound, you have to stick your tongue out, so it can be confusing.
Almost like your screening your speech.
The sound is often flat sounding with too much air coming out of the mouth. Some people even adjust within a few hours! This is because it forces the tongue to pull back, rather than push forward. With tongue thrust, the tongue tends to push through the upper and lower front teeth when swallowing, often causing the lips to open.