teacherJapan You have to brush your teeth well to prevent ( ? ). You could use "gum disease" or" decay" at the end of that sentence; "illness" or "sickness" don't work.
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teacherJapanYou have to brush your teeth well to prevent ( ? ).You could use "gum disease" or" decay" at the end of that sentence; "illness" or "sickness" don't work.