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。
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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