A night guard, also known as an occlusal or bite guard, is a dental appliance used in the treatment of bruxism or teeth grinding, particularly during sleep. This custom-fitted device is typically made of durable plastic and is worn over either the upper or lower teeth. The night guard creates a protective barrier, preventing the surfaces of the teeth from grinding against each other. This helps alleviate the symptoms associated with bruxism, such as jaw pain, tooth sensitivity, and wear on tooth enamel. Night guards are designed to provide cushioning and reduce the impact of clenching or grinding, promoting better oral health and minimizing the risk of dental damage caused by these parafunctional habits.