DS (ASD) has started to grind his teeth. I feel like grind is an understatement, you can hear it from across the room. He does it mostly when he is happy or excited which is a good chuck of the day. He is on winter break from ABA till the 5th but I will talk to the BCBA when he goes back. He will be 3 next month and has never been to the dentist and I don't know how much he would cooperate at the dentist but I think he needs to be looked at because by the sound of it he has to be damaging his teeth. Anyone have experiance with teeth grinding? I will love some advice.