亚洲精品一二三在线观看无修改_国产精品色哟呦一区二区三区四区_国产真实交换配乱婬95视频_精品成人一区二区三区免费看_亚洲免费无码在线观看

Tooth decay will not spread it?

　　According to internationally renowned expert Professor Cui Rongshuo oral description, tooth decay is contagious, is currently not clear in medicine clinical validation. Generally caused by tooth decay or gum disease, bacterial infection is a necessary condition, but not the only condition. Poor eating habits, such as excessive sugar intake, not pay attention to oral hygiene, will lead to tooth decay.

原文翻譯如下：