Sharkbite

Sharkbite (minor) by Stone Gargoyle

"They call me 'Jaws'."

The hero possesses multiple rows of teeth which are sharp and jagged. This allows for easy replacement of damaged teeth when the front ones fall out, back teeth moving forward to fill in gaps. Loss of a tooth will result in one from behind replacing it within 1d4 melee rounds, although any given space in the front row can only be filled up to 8 times.
The hero's bite does 8d6 damage, but this amount will go down each time a full row of teeth is lost, being reduced by 1d6 with each loss of 30 teeth.