How to say “The first time I used the water flosser, I sprayed the whole mirror. You have to close your lips around it.” in Japanese
In Japanese
初めて口腔洗浄器を使ったとき、鏡じゅうに水が飛び散っちゃった。口を閉じて使わなきゃだめなんだね。
Hajimete kōkū senjōki o tsukatta toki, kagami-jū ni mizu ga tobichitchatta. Kuchi o tojite tsukawanakya dame nan da ne.