that's because there's nothing particularly noteworthy about their teeth. it may surprise you to learn that virtually ALL fish have 'teeth' including many species that wouldn't eat another fish if you put it in front of them on a platter. some teeth are just more in evidence than others.but I didn't see any mention of their teeth
some species use their teeth to tear leaves from submerged vegetation, some teeth are used to rasp algae from rocks (african cichlids), and yes, some are used for predatory purposes.