釉可分为五大类，即青釉、酱黑釉、黄釉、绿釉与黄绿釉。
常见的口腔颌面部良性肿瘤有：纤维瘤、脂肪瘤、造釉细胞瘤、神经纤维瘤、血管瘤等。
1·Sealing glair is in last few years method of arisen another kind of hairdressing.
封釉是近几年兴起的另一种美容方法。
2·Development deformation is enamel commonly depauperate, spot glair tooth and too small tooth.
发育畸形常见的为釉质发育不全，斑釉牙及过小牙等。