Over-whitening can also cause teeth to become thin and brittle and can lead to high sensitivity and discoloration as tooth enamel becomes translucent.

美白牙齿过度，会使牙齿变得薄弱。同时，由于牙釉质变为半透明状，会导致牙齿高度敏感、变色。

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Objective To improve the oral health level and life quality in old age, we analyzed non-caries tooth sensitivity to find proper treatment in this study.

目的通过对牙体敏感症状非龋性疾病的分析，寻找适当的治疗方法，以提高老年人的口腔健康水平和生活质量。

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Conclusion By correct diagnosis and proper treatment, tooth sensitivity in aged can get satisfactory effect, and those teeth can be maintained much longer.

结论对老年人牙体敏感症只要诊断正确，治疗方法得当，均能收到理想效果，能显著延长牙齿寿命，以维护老年人口腔的身心健康。

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