Steve,
That is trismus and will only get worse if not treated. You need to do jaw exercises to keep it from getting worse. Some people use tongue depressers, some get a therabite. I even had PT by a someone who specilaizes in trismus which involved intra and extra oral massage. Yawning can also help. Bring this to the attention of your doctors and they should be able to help you.

Take care,
Eileen


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Aug 1997 unknown primary, Stage III
mets to 1 lymph node in neck; rt ND, 36 XRT rad
Aug 2001 tiny tumor on larynx, Stage I total laryngectomy; left ND
June 5, 2010 dx early stage breast cancer
June 9, 2011 SCC 1.5 cm hypo pharynx, 70% P-16 positive, no mets, Stage I