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.
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.