口内
こ
う
な
い
Meanings
1
noun which may take the genitive case particle 'no', noun
oral; inside the mouth
Used in medical, dental, or formal contexts to refer to the interior of the mouth. Often appears in compounds like 口内炎 (mouth ulcer) or 口内検査 (oral examination).
I have a mouth ulcer and eating is painful.
The dentist examined the inside of my mouth in detail.
Usage patterns
- 口内が乾くfor the inside of one's mouth to become dry
Maybe because of the fever, my mouth is extremely dry.
- 口内を清潔に保つto keep the inside of one's mouth clean
To prevent cavities, it's important to keep the inside of your mouth clean.
- 口内に傷ができるto get a sore/wound inside one's mouth
After eating something hard, I got a small cut inside my mouth.