There are no one-size-fits-all Muthguards in Melbourne. Our teeth, jaws, and mouths vary in size and shape from person to person. Sporting goods and department stores sell pre-formed or mouth-formed mouthguards. Pre-formed guards will be the most uncomfortable to wear. Lips must be closed to hold them in place, making breathing and speaking difficult. Mouthguards that are mouth-formed, often known as "boil-and-bite" mouthguards, are more comfortable and have less bulk. They will not, however, fit as snugly or as comfortably around the teeth as a custom-fitted mouthguard.