The patient had been in childhood (calcification period of tooth development) using the tetracycline class of drugs, resulting in discoloration of the teeth.

此患者曾在儿时(牙齿发育钙化期)服用了四环素类药物，导致了牙齿变色。

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At that time, they can also check the bear's teeth, to see if it left a mark after consuming one of their strategically placed bacon-wrapped tetracycline traps.

那时，他们也可以检查熊的牙齿，看看它是否留下了在食用他们策略性安放的咸肉包裹的四环素饵料之后的记号。

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The beneficial rate was over 90% This paper presents the therapeutic method and its procedures for three (?) of tetracycline stained teeth. and this paper also discusses the cause of failure cases.

本文介绍了光固化复合树脂修复三类四环素染色牙的治疗方法和操作步骤，并对失败病例作了总结。

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