

寝る前に歯を磨くのを忘れないでね。
一日に何回歯を磨く?
食事の後に歯を磨くのは大切です。
"みがく(磨く)" is in the lesson "Verbs 1" (Level 1), along with 15 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.