Bruxism
（重定向自Grinding of teeth）
![](/Images/godic/202501/16/Deviated_midline_24157.JPG")
![View from above of an anterior (front) tooth showing severe tooth wear which has exposed the dentin layer (normally covered by enamel). The pulp chamber is visible through the overlying dentin. Tertiary dentin will have been laid down by the pulp in response to the loss of tooth substance. Multiple fracture lines are also visible.](/Images/godic/202501/16/Topviewtooth4157.jpg")
![The left temporalis muscle](/Images/godic/202501/16/Gray3824157.png")
![The left medial pterygoid muscle, and the left lateral pterygoid muscle above it, shown on the medial surface of the mandbilar ramus, which has been partially removed along with a section of the zygomatic arch](/Images/godic/202501/16/Gray3834157.png")
Bruxism is excessive teeth grinding and jaw clenching. It is an oral parafunctional activity; i.e., it is unrelated to normal function such as eating or talking. Bruxism is a common problem; reports of prevalence range from 8–31% in the general population. Several symptoms are commonly associated with bruxism, including hypersensitive teeth, aching jaw muscles, headaches, tooth wear, damage to dental restorations (e.g. crowns and fillings) and damage to teeth. However it may cause minimal symptoms, and therefore people may not be aware of the condition.