Hello, I am an 82-year-old male. I have had two teeth in the back of my mouth missing for the last 60 years. The tongue has filled into that opening. Part of my tongue has been hitting that area for some time, and now I notice a small white area where it hits the tooth. I saw my dentist and was told it was nothing. I had a second opinion with an oral surgeon and he felt it was nothing, but to relive my fear he said a biopsy would confirm to me it is nothing. They both told me what is not, but they did not tell me what it is? Oh, the biopsy would cost me $750.00 whaich is a lot on social security.