Mouth protectors help prevent injury to the mouth area (the teeth, lips, cheeks, and tongue). Because they cushion blows that might cause concussions or lead to jaw fractures they also protect against head and neck injuries.  

While mouth protectors are most commonly use for contact sports, many experts recommend that mouth protectors be worn during any recreational sport where a mouth injury might occur.  

Three types of mouth protectors are available: (1) the ready-made or stock protector, (2) the mouth-formed protector, and (3) the custom-made protector. All three types provide protection, but they differ in comfort, fit, and cost.  

The stock protector is most easily obtained and the least expensive. It is also the least satisfactory because little can be done to adjust the fit, they are often bulky and uncomfortable, they can interfere with breathing and speaking, and the jaws must be closed to hold them in place.  

The mouth-formed protector is best fitted by a dentist, who will shape a plasticized acrylic gel or thermoplastic material to conform to the contours of the teeth. There are two types. The first type is called a shell-liner because the gel is poured into a firm outer shell to form a lining that is secure and well fitted. The inner lining of this type may become hard over time and it is hard to make for those wearing braces.  

The thermoplastic type is most easily formed, since it is usually softened by immersing it in hot water and shaped in the mouth. It can be used with braces if it is professionally fitted, and can often be refitted if it becomes loose.  

The custom-made protector is the most satisfactory of the three types, providing all the qualities found in an ideal mouth protector. It is constructed over a cast made from a dental impression of the athlete's mouth. Although this type is more expensive, the exceptionally good fit, comfort, and overall quality of the protector can make the investment worthwhile. In addition, the custom-made protector is easily retained in the mouth and does not interfere with speech or breathing.