What makes teeth so hard? The hardest part of the tooth is the outer covering called enamel. It is made mostly of a chemical called calcium phosphate. This is different from the chemical that makes up ...
3 天on MSN
The British Dental Association (BDA) said the charges will rise by an average of 2.3% - the lowest level in three years ...
"All you have to do is just give it some time, hover over each tooth, and it's gonna take care of all the motion for you," she said ... Robles said there are many ways to floss the teeth, including ...
一些您可能无法访问的结果已被隐去。
显示无法访问的结果