The term PART TOOTH can be broken down into two parts: ROOT (4 letters). The ROOT of the word 'TOOTH' is 'DENT', which is derived from the Latin word 'DENS'. A TOOTH is a hard, calcified structure found in the mouth of most vertebrates. It is used for chewing and grinding food, as well as providing sensory input to the brain. The ROOT of the word 'PART' is 'pars', which is derived from the Latin word 'partire'. PART can refer to any division or component of a whole. Therefore, the term PART TOOTH can be interpreted as a division or component of a TOOTH.