In mammals, the teeth are.
I. only two sets, present throughout life.
II. embedded in the socket of the jaw bones.
III. different types.
These conditions are respectively referred as
(a) diphyodont, heterodont and thecodont
(b) diphyodont, thecodont and heterodont
(c) thecodont, diphyodont and heterodont
(d) thecodon, heterodont and diphyodont
Most of the mammals have diphyodont (teeth grow In two sets; temporary or milk teeth and permanent teeth). the codont (teeth are embedded in the socketes of the jaw bones) and heterodont teeth(teeth are tour types. i.e. incisors, canines, premolars and molars).