Although the hippo looks intimidating and can be aggressive during the dry seasons, one at Osaka’s Tennoji zoo has been showing its docile side, while enjoying a teeth cleaning service from a vigilant zoo keeper. Adults can have as many as 40 teeth.

This hippo is fed fruit and vegetables daily, which tends to get wedged between them. After the examination and cleaning, he gets fresh fruit as a reward.

Hippo in Osaka's zoo enjoys teeth-cleaning service

Although the hippo looks intimidating and can be aggressive during the dry seasons, one at Osaka's Tennoji zoo has been showing its docile side, while enjoying a teeth cleaning service from a vigilant zoo keeper.