My 18 year old son recently had a bad experience at the dentist about 2 months ago and ever since he has been obsessed with his tongue , taking photos of it , poking it out and pushing back in with fingers. Refusing to talk , spitting out , gargling , it’s getting embarrassing as doing it in public and when people come to home . We have tried to talk to him he says he will stop but then seconds later it continues . I’m at end of my tether as it’s causing arguments in family too with blazing rows , I’m too embarrassed to go anywhere and I’m really down mentally as I’m also cater to my husband who as Parkinson’s . Don’t know where to turn or what to do