如果不及时治疗，牙周炎可能会导致牙齿脱落。

If not treated in time, periodontitis can lead to tooth loss.

骨质疏松可能会导致牙齿脱落。

Osteoporosis may also lead to tooth loss.

老子说，当坚硬的牙齿脱落时，柔软的舌头还在。

Laozi said, when the hard teeth lost, the soft tongue was still there.

严重牙周炎，如近期伴牙齿脱落者危险性更高。

And increased severity of periodontitis, for example with recent tooth loss, had the greatest risk.

这意味着在攻击幼霸王龙时矮暴龙有牙齿脱落。

This means that Nanotyrannus had broken his teeth while attacking this baby Tyrannosaurus Rex.

严重牙周炎, 如近期伴牙齿脱落者危险性更高.

And increased seerity of periodontitis , for example with recent tooth loss, had the greatest risk.

抽雪茄会增加患有口腔疾病和牙病的风险，如牙龈疾病和牙齿脱落。

Cigar smoking increases the risk of oral and dental disease, such as gum disease and tooth loss.

因为长期繁重的生产和哺乳，母狗的牙齿脱落，骨质疏松，后腿瘫痪。

Because of long-time overloaded fertility and lactation, female dogs always have paralyzed hind legs, crisp bone and few teeth.

通过研究化石场，古生物学家们能够将阿尔伯特龙放进现场，因为它吃东西的时候会有牙齿脱落。

By studying the site, paleontologists were able to place Albertosaurus at the scene because as it ate, it shed its teeth.