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指甲掉了可以长出新的，牙齿掉了，就长不回来了。虽然可以植牙、做牙桥、装假牙，但外来的牙齿可能导致疼痛、牙病恶化、甚至影响周边牙齿的健康。

然而，人到了中老年，牙齿就容易松动；甚至很多人在3、40岁时，牙齿就变得不牢固，最后发展到掉牙。

牙龈生病是掉牙的主要起因，在人群中非常普遍。在35至44岁的人中，每5至6人就有1人患有可导致牙齿脱落的牙周、牙龈病。

●如何避免牙齿松动、脱落？

平时吃饭、吃零食，难免会有残余的食物留在牙齿上。如果没有每天刷牙、用牙线做好清洁，食物残渣会一直停留在牙齿表面，逐渐变粘，形成牙菌斑。细菌在牙菌斑上不断生长，产生毒素，就会引起牙龈发炎。

起初，牙龈会发红，刷牙时还会出血，这是因为细菌影响到软组织。这是牙龈疾病的第一步，叫作牙龈炎。

接着，牙菌斑会招来更多的钙沉积，逐渐变得坚硬、结块，就成了牙结石。

出现牙结石后，细菌释放的毒素入侵到牙槽骨里，牙槽骨就开始消退，牙龈也变得红肿。“牙槽骨”可以说是和牙齿共存亡的物质。

牙槽骨萎缩，最终会导致牙齿脱落；牙齿掉落，也会导致牙槽骨吸收、甚至消失。当牙槽骨退化，牙缝间会出现三角形“黑洞”，空隙越来越大，更多的细菌和食物就会卡在牙缝里，形成更多牙结石，牙槽骨也随之退化更快，出血更多、更痛。发展到严重阶段，没有足够的牙槽骨来固定牙齿，牙齿就松动了。

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