Tooth is the slightly bumpy texture you can see and feel on some wrappers. Up close it looks like goosebumps. The bumps are small concentrations of oil in the leaf. A wrapper with a lot of them is called "toothy."
Tooth is most noticeable on Cameroon wrapper, and it also shows on broadleaf and Sumatra leaf. It is more common on sun grown wrappers than on smooth shade grown wrappers such as Connecticut shade. Tooth is a normal feature of the leaf, not a flaw. See wrapper types and colors.