The demineralization of cementum and dentin can occur in a pH range of 6.2-6.8.

骨和本脱矿可以在pH6.2到6。8的范围内发。

The root is covered by cementum, which is a bonelike substance that the periodontal ligament's fibers attach to.

包裹着根的是骨，是一种骨样物，也是周韧带纤维连接的部分。

If the gingiva recedes or plaque forms between the gingiva and the root, bacteria and acids have direct access to the cementum, which is much softer than enamel and dissolves more quickly.

如退缩或和根间形成斑，细菌和酸就可以直接侵犯骨，与釉相比骨更软，溶解更快。

Dental caries lesions typically form in an environment where there are lots of sugars in the mouth and a pH below 5.5 for enamel and below 6.2 to 6.8 for cementum and dentin.

龋齿一般发在口腔中多糖、釉pH低于5.5、骨和本pH处于6.2到6。8的情况下。