teeth

A man cleans the teeth of a hippopotamus at a wild life reserve park in Guangzhou

Alex Lee/Reuters

A man cleans the teeth of a hippopotamus at a wild life reserve park in Guangzhou, Guangdong province in China.

A man walks in front of a huge poster advertising a cosmetics company in Tokyo, Tuesday, June 18, 2013.

Itsuo Inouye/AP

A man walks in front of a huge poster advertising a cosmetics company in Tokyo on Tuesday.

A person visits the exhibition "Requins" (Sharks) on June 7, 2013 in Oceanography museum in Monaco. The exhibition opens on  June 8 on the eve of World Oceans Day.

Valery Hache/AFP

A person visits the exhibition “Requins” (Sharks) on Friday in Oceanography museum in Monaco. The exhibition opens on June 8 on the eve of World Oceans Day.