The goal is to find a mouth guard that fits well and is comfortable enough that you will wear it. A properly fitted mouth guard will stay in place while it is worn, making it easy to talk and breathe. Simpler models are a simple plastic shell more or less adapted to the dentition. Some manufacturers make guards just for braces with a bit larger fit and good protection to prevent cuts or lacerations from the braces. The best quality mouth guards are custom made from dental molds made by a dentist or orthodontist.