Sneaking in to be the winner of the most teeth for a vertebrate is the common leaf-tailed gecko of Madagascar (Uroplatus fimbriatus). According to Guinness World Records, it "possesses 169 teeth ...

Only a handful of mammals can regrow teeth multiple times, compared to the 50,000 species of reptiles and fish. Take geckos, for example, who will replace all 100 teeth, or so, every 3 to 4 months.