Bears have undeveloped carnassial teeth, which are large teeth found in many carnivorous mammals, used for shearing flesh and bone in a scissor like way.
Bears have 42 teeth. Their canine teeth are large, and the molar teeth flat and crushing and there are variations within species.
Polar bears appear to have secondarily re-evolved fully functional carnassials, as their diets have switched back towards carnivory. The dental formula for living bears is: 3.1.2-18.104.22.168-4.3