科研之友
微信
新浪微博
Facebook
分享链接
摘要
<正>钙是牙齿的保护层,负责保持牙釉质健康。钙的天然外观是白色的,因此健康的牙齿看起来是白色的。然而当你的牙釉质受损时,黄色的牙本质就会暴露出来。Calcium is responsible for keeping your enamel—the protective outer layer of your teeth—healthy and strong.Because calcium is naturally white in appearance, healthy teeth also have a white appearance.
