Join Date: Sep 2011
Location: In Sunny, HOT and HUMID S.C.
I can't honestly tell for sure from the angle on the picture of the surface area. I suppose it could be 20, but I can't say for sure. From the first photo the left top tooth is developing a hook on the back from lack of surface contact on the bottom. It's not uncommon and treatable when they get floated.
They're always going to be bigger and stronger so you better always be smarter. (One of my grandfather's many pearls of wisdom)