Thelma-Louise

Its good you noticed it now before this becomes a very painful problem (tmj). Yes it could be the result of your braces or malocclusion of the teeth not meeting correctly - either caused by the braces or the teeth shifting back to their original position due to not wearing the retainer. Even the process of having fillings done can cause one side to become slightly lower. You may want to see an ortho about it or a neuromuscular or tmj dentist trained in FJO - basically what they may want to do is try a splint which raises or lengthens the height of the teeth on the affected side to see if that helps the bite become more balanced without causing other adverse symptoms and once your bite is stabilized to then decided how to make it permanent - whether thru ortho or building the teeth up again with overlays or crowns. Try not to be talked into having the other side filed down (equilibration) as that often starts a seesawing effect of one side feeling lower/higher and then the other, etc.

A lot of people have one side that meets first or one side that seems lower - without experieicing any muscular problems or pain, problems with chewing, or other tmj symptoms like clciking or popping - so if its not significantly affecting you right now you may just want to let you dentist know about it at your next appt and keep on eye on it for any further progression or changes such as more shifting, soreness along the jaw line or sensitivity of the teeth, ear aches or headaches, etc since these can be signs this may become a real issue.