* Custom Fitted: These are made by your dentist for you personally. They are more expensive than the other versions, but because they are customized, usually off the best fit.
* Stock: These are inexpensive and come pre-formed, ready to wear. Unfortunately, they often don't fit very well. They can be bulky and can make breathing and talking difficult.
* Boil and Bite: These mouth protectors can be bought at many sporting goods stores and drug stores and may offer a better fit than the stock mouth protectors. They are first softened in water (boiled), then inserted and allowed to adapt to the shape of your mouth.
Dr. James L. Johnson