剪牙要剪成平齿，不伤及牙龈，防止细菌感染；

Cut cut teeth to cut teeth and gums, don't hurt, prevent bacteria infections;

youdao

剪牙要剪成平齿，不伤及牙龈，防止细菌感染；

Cut cut teeth to cut teeth and gums, don't hurt, prevent bacteria infections;

youdao