Evolution led to loss of teeth in some vertebrates

Evolution led to loss of teeth in some vertebrates like birds and in some types of whales, a phenomenon called adontia while some vertebrates in the course of evolution retained homodont. For example, dolphins have a set of 200 similar teeth in their dentition (6). Changes in morphology and the number of teeth was a major result of evolution in mammals. Mutations that occurred during evolution resulted in complexity in dentition of vertebrate teeth. For example, some mammals like rats have no incisors and premolars while Ruminants like sheep have no canines and incisors on their upper jaws.