M

malocclusion
misalignment between the upper and lower teeth

mandible
the lower jaw

margin
point of contact between a restoration and the tooth

maryland bridge
a bridge that is permanently cemented by wings only to the backs of the adjacent teeth; this type of bridge can be placed in the front when it is undesirable to prepare the adjacent teeth all the way down, but it generally does not last as long as conventional bridges

maxilla
the upper jaw

milk teeth
baby teeth

mixed dentition
refers to the presence of both deciduous and permanent teeth

molars
the three back teeth in each quarter of the mouth, including wisdom teeth