A dental comb, also known as a toothcomb, is primarily used for grooming.
While animals lick their fur to clean it, they will use the toothcomb to comb through their fur. The teeth of the comb often have fine grooves or striations, which are created during the grooming process by the hair. These grooves can be observed under a scanning electron microscope.
In summary, the primary function of a dental comb is self-grooming, helping the animal maintain a clean and healthy coat.