noun, noun which may take the genitive case particle 'no'
inside of the mouth; oral cavity
Refers to the interior space of the mouth. Used in medical, dental, and everyday contexts.
口中が乾いて仕方がない。
My mouth is unbearably dry.
口中を清潔に保つことは虫歯予防に大切です。
Keeping the inside of your mouth clean is important for preventing cavities.