It quite depends on how you stretched it out. If you grind your teeth on that side, or excessively chew gum on only that side, or something like that, you need to control it and not do that. If it's something you do involuntarily, then you need to see a physician. One possible treatment to reduce it is with Botox injections. But the issue that you are having that's creating the problem and stretching must first be addressed.
