My son (almost 16) has been diagnosed with and is actively undergoing treatment with meds, etc. for his ADHD/Mild Tourettes since he was 7 years old. One thing I have noticed in the past year is that he gets mild tics (opening of his mouth, etc.) more often whenever he is nervous/stressed -- especially when he is performing -- he is very actively involved in drama and vocal performances. Usually once I talk to him about it, he seems to calm down and they do go away slowly. Once thing I have done is give him some chewing gum to chew on and it does help, but when he's singing that's not an option. Any advice to help him with this?

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