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Description
We never see much of "airplane teeth" in the Planes/WoC movies. Here is some speculation on what it could look like when the lips are pulled back or they open REAL wide. Because of their long muzzles, it may be that their dental arrangement is not unlike a horses's, except that what would be a distinct set of incisors in the horse's mouth would be "superincisors" in the mouths of most planes and other long-muzzled vehicles. This may have been an adaptation to facilitate speech and to provide a clean, uniform surface with no cracks or crevices that could trap food particles, since they had little means of cleaning their own teeth. Once in a while, however, atavistic examples of vehicles with distinct incisor sets or crevices or gaps in front teeth show up (eg., Mater, Maru). Ground vehicles and helicopters lack bars and their teeth finish growing once the adult set comes in. Planes, however, must have their teeth floated on a regular basis (again, like horses) since the grazing and browsing days of their species are long behind.

Description
We never see much of "airplane teeth" in the Planes/WoC movies. Here is some speculation on what it could look like when the lips are pulled back or they open REAL wide. Because of their long muzzles, it may be that their dental arrangement is not unlike a horses's, except that what would be a distinct set of incisors in the horse's mouth would be "superincisors" in the mouths of most planes and other long-muzzled vehicles. This may have been an adaptation to facilitate speech and to provide a clean, uniform surface with no cracks or crevices that could trap food particles, since they had little means of cleaning their own teeth. Once in a while, however, atavistic examples of vehicles with distinct incisor sets or crevices or gaps in front teeth show up (eg., Mater, Maru). Ground vehicles and helicopters lack bars and their teeth finish growing once the adult set comes in. Planes, however, must have their teeth floated on a regular basis (again, like horses) since the grazing and browsing days of their species are long behind.