A night guard, often referred to as an occlusal splint or bite guard, is a custom-fitted device worn over the teeth, typically during sleep. Its primary function is to create a physical barrier between the upper and lower teeth to protect them from grinding and clenching, a condition known as bruxism. Because a new appliance is introduced, it is common to experience some initial discomfort or soreness. This temporary adjustment phase is expected as the body adapts to the new oral environment and the change in how the jaw rests.
Why Initial Discomfort Occurs
The sensation of soreness or tightness is largely due to the guard changing the established position of your bite, forcing the jaw to meet in a slightly different alignment. The muscles that control the temporomandibular joint (TMJ) must now retrain themselves to function in this altered resting position. This muscular retraining can manifest as minor aching in the jaw, similar to having worked out a previously underused muscle group.
The teeth themselves may also feel a general pressure or slight sensitivity because they are now held in place by the guard. The presence of any foreign object in the mouth can initially trigger an increase in salivation, adding to the odd or bulky sensation. Sometimes, the guard’s material, especially rigid acrylic, contributes to discomfort. A guard that is too thick or bulky may also temporarily limit the jaw’s natural movement, leading to muscle fatigue when you wake up.
The Typical Adjustment Timeline
The initial discomfort is temporary, with the adjustment period typically ranging from a few days up to two weeks. The first few nights are often the most challenging as the mouth and jaw muscles begin to adapt to the appliance. A noticeable reduction in soreness and strange sensations often occurs within the first three to seven nights.
Consistency in wearing the guard every night is important to accelerate this adjustment process. Skipping nights resets progress, making the adjustment period longer and more difficult when the guard is reintroduced. While most people find the guard unnoticeable after two weeks, those with significant temporomandibular joint issues may require up to three weeks to feel completely comfortable.
Managing Discomfort and Recognizing Warning Signs
To alleviate the mild initial soreness, over-the-counter pain relievers such as ibuprofen can be taken before bed for the first few nights. Applying a warm compress or heating pad to the jaw area for ten to fifteen minutes before wearing the guard helps relax the jaw muscles. Gentle jaw stretching exercises, like slowly opening and closing the mouth, may further reduce muscular tension.
While mild discomfort is normal, certain signs indicate the need to contact your dentist immediately for an adjustment. Any sharp, stabbing pain or pinching on a specific tooth or the gums suggests a fit issue. You should also seek advice if the guard feels loose, slips easily, or is so tight that it is difficult to remove. Persistent morning headaches or jaw pain that continues beyond the two-week adjustment period, or any noticeable change in how your teeth align when the guard is not in your mouth, are indications that the fit needs to be re-evaluated.