牙齿慢性龋将趋于较深的颜色，因为边缘龋洞被正常吃的食物所染色。
Teeth with chronic caries will tend to be darker in color because the edges of the cavities become stained from normal eating and drinking.
结果提示：深龋引起的长期有症状的慢性牙髓炎，尽管未穿髓，牙髓组织中，仍可有大量活细菌长期存在。
The results point out: chronic dental pulpitis, with long-term symptoms, caused by deep caries, though do not perforate into pulps, there may be many living bacteria in their pulp tissues.
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