Tooth type (5)
(Other definitions for incisor that I've seen before include "something with bite" , "Canine" , "carnivore requires?" , "Narrow-edged tooth" , "Chisel-edged tooth" .)
'tooth type' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for molar that I've seen before include "Type of tooth" , "Large tooth" , "that could be capped" , "of ivory, perhaps" , "Dealing with masses" .)
(Other definitions for premolar that I've seen before include "Grinder" , "Tooth -- real romp (anag)" , "Type of tooth" .)