My trismus occurred due to the type of surgery and was at its worst prior to radiation. It was first diagnosed and became a concern when I met with my RO for the first time to discuss my radiation. It was so bad that he could not even start my radiation until it improved because I couldn't open my mouth wide enough to get a tongue guard in my mouth. Right then and there he gave me the therabite and had me begin exercises for a week. I made pretty good progress the first month went from about a 14 to a 21 (which is about 2 fingers). This is where I got stuck. I have not been able to make any progress. I have now passed the one year, since treatment. I have learned to eat with this but I worry about if I have to have any dental work. How would they be able to do anything in the back?