Hi, I have a white head spot on the posterior lateral tongue , it looks shiny and white. It has been there for 3 weeks, and although I have been to show it to a dentist he didnt think it was a cause for concern but did not say what it may be. This was over a week ago, and the little spot is still there. It is painless but if I do try to probe it, it feels like there is something on my tongue bothering me. thanks