牙钻，也称为口腔医用手机为口腔科专用医疗器材，是用来清洁牙石，研磨龋齿坏牙的器械。手机种类较多，根据转速和结构可分为高速手机和低速手机。

1. 高速手机利用高压空气驱动手机机头内的微型涡轮可涡轮转速达（3-5）×10r/min，车针的切削线速度可达15m/s，
2. 低速手机由于是齿轮转动，转速仅为每分钟数千转。低速手机通常可由速度调节结构调节速度。

A dental drill or dentist's drill is a small, high-speed drill used during dental procedures, usually to remove decay and shape tooth structure prior to the insertion of a filling or crown. A dental drill may also be used in the cleaning and shaping of root canals during endodontic treatment, or to remove old or temporary fillings or crowns prior to the insertion of new or permanent restorations. The term "dental drill" is considered the more colloquial form of the term "dental handpiece," although it can also be construed as to include the power source for one or more handpieces, a "dental engine." "Handpiece" and "engine" are more generic and euphemistic terms for generic dental tools.