My son is 19 months old and has started to grind his teeth again. I try to give him his toothbrush but he ended up tearing it to pieces. Then I gave him cold teething toy... he discarded that after five minutes. He chews on his fingers, shoes, and plastic toys. I even tried teething tablets. If anyone else is going through this and found something that works please tell me. I don't want him ruining his teeth.