This is the 4782nd most frequent Japanese word.
歯磨き
Toothbrushing; toothpaste.
Here, "歯磨き" refers to the act of brushing teeth, used as a noun activity.
歯磨きをするのは毎日の習慣です。
Brushing teeth is a daily habit.
In this sentence, "歯磨き" denotes the specific method or practice of brushing teeth, making it an instructional context.
子供に歯磨きの仕方を教えています。
I am teaching the child how to brush their teeth.
Here, "歯磨き" is connected with "粉" (powder) to denote toothpaste, showing a compound usage.