Failure mode of tooth surface is varied such as teeth surface pitting, teeth wear, teeth bonding and teeth plastic deformations and so on.

齿面常见的失效形式有齿面点蚀、齿面磨损、齿面胶合和齿面塑性变形等。

youdao

Fenelon's is a plastic set of parallel vertical tracks with teeth.

FORBES: Technology

Many parents don't think twice about straightening their kids' crooked teeth but stop short of fixing a crooked nose, and yet, in just the past seven years, plastic surgery performed on teens has doubled.

CNN: ASIANOW - TIME Asia | Brainteaser