The second method is to move upper and lower teeth by archwire lingually and bucally.

二是利用上下颌的正畸弓丝移动上下牙齿向颊、舌方向；

youdao

Daily before meals to relax the body, lips close, then the upper and lower teeth have quietly tapping rhythm.

每日三餐前坚持全身放松，口唇轻闭，然后上下齿有节律地悄悄叩击。

youdao

Teeth of good size. Jaws strong with a perfect, regular and complete scissor bite, i. e. upper teeth closely overlapping lower teeth and set square to the jaws.

牙齿形状好，强壮的颌，完美的规则的剪刀状咬合，比如上齿紧紧覆盖下齿在口中构成三角形。

youdao

The exact cause of teeth grinding is not known, but the most likely culprits are things like stress, sleep disorders, crooked or missing teeth and having an abnormal bite, where the upper and lower teeth do not come together normally (known as malocclusion).

CNN: What can I do about teeth grinding?