Mammalian teeth come in many different forms and differ from the teeth of reptiles in that mammals have evolved heterodonty which is the condition of having specialised teeth for different functions. Reptiles have uniform teeth that do not differ in form or function, the condition known as homodonty. Mammalian teeth fall into four different categories, each with different form and function. At the front of the mouth are incisors, behind which is a pair of canines which may or may not be present, followed by premolars and molars. Apart from canine teeth of which there is always only one or none on each side, the number of each tooth type varies by species. Us humans have in total (usually) 32 teeth, of which eight are incisors, four are canines, and eight premolars and molars.
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