 Amphibians usually swallow food whole but may chew it lightly first to subdue it . They typically have small hinged pedicellate teeth , a feature unique to amphibians . The base and crown of these are composed of dentine separated by an uncalcified layer and they are replaced at intervals . Salamanders , caecilians and some frogs have one or two rows of teeth in both jaws , but some frogs ( Rana spp . ) lack teeth in the lower jaw , and toads ( Bufo spp . ) have no teeth . In many amphibians there are also vomerine teeth attached to a facial bone in the roof of the mouth . 
