Hi we used a speech therapist for our second son,he had what they call a lazy tongue,needed extra help with pronouncing letter`s and had to do mouth and tongue exercises in front of a small mirror,& I had to help him practice what the speech therapist had given us while she was seeing him...alot of competive words,over & over until they can get it right.It`s well worth the money,instead of people saying "What did they say...."God that use to pee me off. Good luck.