Translation guide
The English word "teeth" refers to the hard structures in the mouth used for biting and chewing. In Japanese, the most common word is 歯 (は), but there are also specific terms for baby teeth, wisdom teeth, and related expressions.
teeth
The hard, white structures in the mouth used for biting and chewing.
The standard word for 'tooth' or 'teeth'. Japanese does not usually distinguish singular and plural; context determines the number.
毎日歯を磨きます。
I brush my teeth every day.
My tooth hurts.
The first set of teeth in children, which are later replaced by permanent teeth.
Literally 'milk teeth'. The standard term for baby teeth.
My child's baby tooth fell out.
The second set of teeth that replace baby teeth and are meant to last a lifetime.
Literally 'permanent teeth'. Used to distinguish from baby teeth.
Her permanent teeth are coming in.
The third molars that usually appear in late adolescence or early adulthood.
A hole in a tooth caused by decay.
The habit of grinding or clenching the teeth, often during sleep.
The act of grinding one's teeth, often unconsciously.
I'm told I grind my teeth at night.
The tool used for cleaning teeth, or the action of cleaning them.
A paste used with a toothbrush to clean teeth.
Japanese nouns do not typically change form for plural. 歯 (は) can mean 'tooth' or 'teeth' depending on context. If you need to specify multiple teeth, you can use counters like 本 (ほん) for counting teeth, e.g., 歯が二本抜けた (I lost two teeth).
I got pericoronitis (inflammation around a wisdom tooth).
I prefer paste toothpaste.