Then, I attach the missing tooth (pontic) to the crowns.

然后我把掉牙的地方与牙冠连接上。

youdao

The upper tooth that was biting against the missing lower tooth will drop downward, because there's nothing below it to hold it in place.

原来与这颗牙拔掉上下咬合的上排的牙齿，因为在它底下没有牙齿承住它，会变的往下突出。

youdao

But tooth missing is precisely one of the common and frequently-occurring diseases in middle-aged persons and old persons, in particularly the elder.

而牙齿缺失，正是中老年人，尤其是老年人的常见病和多发病之一。

youdao

Al-Zaidi, who faced the cameras wrapped in an Iraqi flag, was missing a tooth, but otherwise appeared in good health.

VOA: standard.2009.09.15

When she and Marjorie arrived home from church one Sunday to find the space where the stereo had sat looking as vacant as a missing tooth, Candy had felt a rush of elation.

NEWYORKER: The Visitor