I wedged cotton rolls between my inner cheeks and the crowns and also my tongue and the crowns and I think it helped the side scatter a little bit. The nurses station would provide them for me. It was an additional pain in the butt to position those things and keep them in place for the entire treatment but I did. You might try wearing your dental trays if you have them. Check with the RO first. They also have generic mouth guards and I tried them as well.