While the cost of a custom night guard may seem a lot more than the stock variety, you need to consider the costs that a custom night guard will prevent. Bruxism is the leading cause of dental damage and root canals. A root canal is an expensive dental procedure and one that night guards help prevent. As you grind your teeth, you wear down the enamel, increasing the risk of dental decay and injury to the tooth, resulting in more costly dental procedures. Unlike stock mouth guards, a custom guard ensures that your jaw is properly aligned. A stock guard does not do this and disrupting jaw alignment can cause even more issues.