Mouthguards
Study after study shows that the risk of facial and head injuries decreases with the use of a mouthguard. Naturally, the better the mouthguard, the more supportive it will be on impact, so using a cheaper guard is likely to increase your risk of injury. The fit is crucial-a non-retentive mouthguard may not be in proper position at moment of impact-like a helmet that doesn't fit. However, the biggest risk of all is to not have a mouthguard. Any mouthguard is usually better than none.
Nightguards
A nightguard with a good fit also poses no risk to you. Therefore, the only risk you face is that your nightguard does not fit well or that it is worn out. If you're not following up with the dentist, including bringing the nightguard to every checkup, you could cause yourself harm-the symptoms of headache and sore jaws will probably persist or return, and the damage to your teeth will resume.
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