You have not mentioned when you got the braces treatment done. The problem in opening the mouth can be because of various causes. It canbe because of erupting wisdom teeth, because of some trauma in the TMJ area or some infection in the TMJ area Some times there is difficulkty in opeing the mouth after getting some extraction as the extraction socket get infected especially in case of back teeth. You have to visit the dentist to get the diagnosis made. Because the treatment varies with the cause. For more info on lock jaw you can visit the following link....www.identalhub.com/article_causes-of-tmj-disorder-195.aspx.
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