Your smile depends on simple dental care habits, such as brushing and flossing.自信的笑容取决于简单的牙齿护理习惯，如刷牙和使用牙线。The dentist repeatedly stressed the importance of flossing regularly.牙医反复强调定期用牙线洁牙的重要性。Regular flossing is essential for healthy gums.经常用牙线清洁牙缝对保持牙龈健康有必要。She was flossing her teeth at the time.当时她正在用牙线剔牙。