有一部分动物和人一样，换上恒牙后就保持了，这种动物，老年时，绝大多数都有口腔问题。有的中年就有了。其实它们的中年也就是我们人类的童年，和人类龋齿发病时间差不多。养过猫狗的应该知道，医院的牙科是多么火爆的一个科系，天天洗牙，周周补牙拔牙。猫狗还是不吃糖，食物淀粉含量很低的动物呢。但是同样也会形成牙结石，而且严重起来牙结石比牙齿还大，张嘴可以熏死人。一些老年动物甚至会因为口腔细菌和炎症诱发败血症而死亡。
前方高能预警：
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