Teeth grinding or bruxism is a neuromuscular disorder that can damage and loosen the teeth. The severity of teeth grinding varies with the individual. Children usually outgrow the condition. Stress and abnormally aligned teeth are common causes of teeth grinding and treatment should focus on these factors. Night guards are effective devices to treat teeth grinding. Night guards are made of high-grade plastic. They are worn at night and they prevent the upper teeth from grinding against the lower teeth. Comfort and durability are important considerations when purchasing a night guard. Although ready made night guards are available at many stores, custom-fit night guards prepared by dentists obviously have a better fit.