The bottom edges of my two front teeth have apparently "cupped." Basically, its like I've lost part of the bottom edge of my two front teeth. The back is uneven and its really really transparent. Like you can clearly see it black compared to the rest of the tooth because it is much thinner than the rest. Its been progressively becoming worse and more noticeable. Is there a way to prevent further deterioration. And at my next dentist appointment can it be treated? Is there a procedure to fill this loss?