 The dental formula of slow lorises is 2 @.@ 1 @.@ 3 @.@ 32 @.@ 1 @.@ 3 @.@ 3 × 2 = 36 , meaning that on each side of the mouth there are two upper ( maxillary ) and lower ( mandibular ) incisors , one upper and lower canine tooth , three upper and lower premolars , and three upper and lower molars , giving a total of 36 permanent teeth . As in all other crown strepsirrhines , their lower incisors and canine are procumbent ( lie down and face outwards ) , forming a toothcomb , which is used for personal and social grooming and feeding . The toothcomb is kept clean by the sublingua or " under @-@ tongue " , a specialized structure that acts like a toothbrush to remove hair and other debris . The sublingua extends below the tip of the tongue and is tipped with keratinized , serrated points that rake between the front teeth . 
