揭秘:牙齿美白能否DIY?

　　Professor Andrew Eder, clinical director of the London Tooth Whitening Centre, said using baking soda repeatedly would strip the teeth of enamel, leaving them browner and more sensitive, while salt would scratch the enamel and any use of acid was especially damaging.

　　伦敦牙齿美白中心临床主任安德鲁 埃德尔教授表示，反复使用小苏打会损害牙釉质，牙齿会变得越发暗沉、敏感；用盐可能会刮伤牙釉质；而使用任何盐酸美白牙齿带来的伤害则更大。