My son has vocal tics but he has not been diagnosied with TS. Whenever he washes his hair, his vocal tics increase for the rest of the day. The next day his vocal tic is almost silent. He does take Intuniv but on days when he washes his hair, this medication does keep his vocal tic under control. So I assume that the act of washing his hair is a trigger. Is there anyway to bring this trigger under control? Could this have anything to do with his shampoo or an ingredient in the shampoo? Any ideas?