underbite

listen to the pronunciation of underbite
Английский Язык - Турецкий язык
(Diş) Alt dişlerin önde olması durumu

He has an underbite so his mounth is often open.

Английский Язык - Английский Язык
A malocclusion, in which the lower teeth extend past the upper ones
(Diş) The projection of the lower teeth beyond the upper