In 1958 scientists in st Louis began a campaign to collect baby teeth to study the link between above-ground testing and human exposure.

1958年，圣易路斯的科学家们就开始收集婴儿的牙齿以研究地面试验与人类接触之间的联系。

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Objective To explore the effects of fluoride exposure on the teeth of workers.

目的研究氟暴露对工人牙齿的影响。

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Objective To study the clinical result of the impacted maxillary teeth by using both of surgical exposure and orthodontics.

目的探讨上颌埋伏前牙通过手术导萌和正畸联合治疗的临床效果。

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The changes were made because it was discovered that infective endocarditis is more likely to occur after frequent exposure to bacteria from routine activities such as chewing food or brushing one's teeth than from occasional dental, gastrointestinal tract or genitourinary tract procedures.

CNN: Why do I no longer need an antibiotic before teeth cleaning?