Avian dentitions also pose a problem for the dinosaur hypothesis. While theropod teeth are serrated and have straight roots, avian teeth, like those of crocodilians, are unserrated, with constricted bases and expanded roots.
http://www.pterosaur.co.uk/identify/teeth/teeth.htm
Most pterosaur teeth are relatively smooth with an oval section and no ridges. They tend to taper evenly to the tip and can be straight or gently curved along their length.
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