Hi, This is regarding my dad. He is a patient who was having maxillary cancer. His left jaw has been removed completely and operated multiple times. Now his mouth opening is very limited with no denture. Now currently he is cancer free but has tooth pain and his lower tooth has cavity in it. Due to the limited opening the Oncologist he visits said nothing can be done for the tooth. Would you know a way to help him with the pain and suggesting a solution?