TETSUO, a hippopotamus (male), has zookeepers brush his teeth and a give him physical check-up.
Despite being an aggressive and powerful animal, hippos in the wild let other animals clean their teeth. Normally, those animals are fish or birds, but there is a known case at the Zurich Zoo, where a hippo was having a zebra clean its teeth. This wonderful hippopotamus is being a great patient, and is teaching us a lesson to not forget to brush our teeth, and to have regular checkups.
Jurassic Gorilla, Gorilla Harry T-Shirt https://jurassicgorilla.com