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Why are teeth not part of the skeletal system?
Teeth, like bones, contain calcium, phosphorus, and other minerals. But there's one substance that teeth don't have—collagen. Collagen is a type of protein, considered as “the glue that holds the body together”. Unlike a broken bone, a broken tooth cannot mend itself.
现已上线!2025 年 Telegram 研究 — 年度关键洞察 
