question: HI I HAVE LOST QUITE A  FEW TEETH AND IN THE RIGHT BOTTOM GUM IN THE BACK WHERE A TOOTH WAS EXTRACTED A FEW YEARS AGO THERE IS A LITTLE WHITE SPOT AND IT JUST FEELS LIKE A PIECE OF FOOD BUT I LOOK IN THE MIRROR AND THERE IS A WHITE SPOT I AM NOT SURE WHAT IT IS DO U HAVE ANY SUGGESTIONS