

寝る前に歯を磨きます。
まだ歯が痛いですか。
子どもの歯が抜けました。
"は(歯)" is in the lesson "Body parts 1" (Level 2), along with 14 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.