Chinning

Anyone’s child used chinning (firm pressure on their chin to express happy or sad emotions, same use as other stims…)? My 8 yo is chinning a ton and he’s starting to press so hard it pops his jaw. We are worried about him hurting his jaw over time. It also can look like he is going to bite to takes people by surprise. We have tried a TON of replacement because we know he needs the input/regulation and no luck. Anyone have this in their family or any Autistics on here with experience to share? Appreciated.