This is an issue I too have asked about and am still curious on. The top of my tongue is numb but yet it really bites with anything like even katchup. I have a rough spot something like dry skin closer to the back of my tongue. I have had sharp pains at the tip of the tongue just above the connection of the free flap then lately my tongue has been doing some funky tingling thing. I was scheduled to see my onclolgoist on Feb 25 but got a letter saying the appointment will have to be pushed back to March 31. So if anybody gets any insite I would be glad to hear theories on this ...