A mouthguard is a protective device worn inside the mouth, usually over the teeth, designed primarily to reduce the risk and severity of dental and oral injuries during activities involving impact, collision or projectile hazards. Mouthguards can cushion blows to the teeth and surrounding oral structures, distribute impact forces and provide a physical barrier between teeth and soft tissues.
They are used particularly in contact and collision sports, although the need and recommended type depend on the activity and level of risk. A mouthguard does not guarantee protection from concussion, jaw injury or every form of facial trauma, and claims that it universally prevents head injury should be treated cautiously. Its clearest established purpose is protection of the teeth, gums, lips and other oral structures from direct or indirect sporting impacts.
Mouthguards are generally made from resilient polymer materials capable of deforming under impact while retaining sufficient shape to remain positioned around the teeth. The material must balance flexibility, durability, comfort and shock absorption. A properly fitted mouthguard should remain stable during activity without requiring the athlete to clench constantly to keep it in place. This allows the athlete to breathe and communicate more effectively than with a poorly fitted device. The protective performance depends on thickness, material, coverage and retention as well as the characteristics of the impact. A device that is thin, loose or poorly positioned may offer less protection than one designed and fitted appropriately for the athlete and sport.
There are several broad categories of mouthguard. Stock mouthguards are manufactured in predetermined shapes and sizes and generally offer limited customisation. Boil and bite mouthguards are softened in hot water and then adapted to the user's teeth, producing a more individual fit than a generic stock design. Custom made mouthguards are produced from dental impressions or digital scans and can be manufactured to fit an individual's dentition more precisely. Customisation can improve retention, comfort and potentially protection, although quality depends on the manufacturing process and material. The appropriate choice depends on factors such as the athlete's age, dental anatomy, sport, orthodontic treatment, budget and required level of protection.
A mouthguard can help protect teeth from fractures, displacement and other forms of dental trauma by creating a cushioning layer between the upper and lower teeth and between the teeth and external objects. It can also reduce the likelihood that the lips or cheeks will be cut by the teeth during impact. This is particularly relevant in sports where collisions or falls are expected. However, the mouthguard does not protect every anatomical structure equally. It does not cover the entire face, and it cannot prevent every jaw, facial or neurological injury. A mouthguard should therefore be regarded as one component of a broader protective strategy rather than as comprehensive head and neck protection.
Fit and retention are central to effective use. A mouthguard that becomes displaced during activity may fail to cover the intended teeth and can interfere with breathing or communication. Athletes with braces or other orthodontic appliances may require specialised designs because the relationship between the appliance, teeth and soft tissues changes as treatment progresses. Children and adolescents may also require periodic replacement because their teeth and jaws are developing. Dental conditions can further influence the appropriate design. A dental professional can provide advice and custom fitting where necessary, particularly for athletes with complex dental requirements or orthodontic treatment.
Hygiene and maintenance are important because a mouthguard is exposed to saliva, food debris and environmental contamination. It should generally be cleaned according to appropriate manufacturer or dental guidance, allowed to dry properly and stored in a ventilated protective container when not in use. Excessive heat can distort some materials, so storage in very hot environments or exposure to inappropriate cleaning methods can damage the device. Athletes should inspect the mouthguard for tears, thinning, deformation or loss of fit. Replacement may be necessary after significant damage or when growth, dental treatment or ordinary wear changes its fit. Sharing mouthguards is inappropriate because they are personal oral devices and can create hygiene concerns.
Mouthguards can influence breathing, speech and comfort, particularly when poorly fitted. A high quality properly fitted device should minimise unnecessary interference, but athletes may need an adaptation period before competition. Communication can be especially important in team sports where players must call instructions during play. Athletes should therefore practise using a new mouthguard during training rather than first wearing it in a major competition. If the device causes persistent discomfort, gagging, difficulty breathing or inability to speak normally, its fit should be reviewed. Comfort is not merely a convenience because uncomfortable equipment can reduce adherence, and protective equipment that an athlete does not wear provides no protective benefit.
The principal purpose of a mouthguard is to reduce oral and dental injury risk during sporting impacts. Its effectiveness depends on appropriate design, material, fit, retention, maintenance and consistent use. It should not be promoted as a guarantee against concussion or all forms of head injury, because the evidence and mechanisms involved are more complex than dental protection. The choice between stock, boil and bite and custom made devices depends on individual circumstances and the demands of the activity. When correctly selected and maintained, a mouthguard provides an important layer of protection for athletes participating in sports where facial and dental impacts are reasonably foreseeable.
