The act of brushing one's teeth; can refer to the routine or time spent brushing. Also used with 'suru' as a verb.
毎朝、朝食のあとですぐ歯磨きをします。
Every morning I brush my teeth right after breakfast.
子どもに正しい歯磨きを教えるのは大切だ。
It's important to teach children how to brush their teeth properly.
寝る前には必ず歯磨きを忘れないでください。
Please be sure not to forget brushing your teeth before bed.
Dentifrice; toothpaste or tooth powder used for brushing teeth.
新しい歯磨きを買って、ミント味で気に入った。
I bought new toothpaste and liked the mint flavor.
歯医者にすすめられた歯磨きを使っている。
I'm using the toothpaste recommended by the dentist.