精选优质文档-倾情为你奉上it 4一般现在时【概念引入】对于口腔保健，相信大家首先想到的就是每天必做的“刷牙运动”。但是除此以外，你还想到其他的口腔卫生习惯吗？看完下面这篇关于口腔清洁的短文，大家一定会更全面地了解口腔保健知识：A set of healthy teeth attracts people to your smile. Good oral hygiene helps us keep our teeth and mouth healthy. So work on these oral habits now:Brush your teeth at least twice a day, and spend at least 2 to 3 minutes brushing your teeth. Use a soft-bristle toothbrush that will not scratch your gums. Replace the toothbrush every 3 to 4 months.Floss your teeth onc
