Splint or Night Guard? How TMJ Splints Work

People often call a stabilization splint a night guard and assume it only protects the teeth. But for a jaw with overactive muscles, a displaced disc, or teeth that meet unevenly (occlusal interference), a correctly designed splint does something more specific: it stops the bite from dictating jaw position, so the muscles and joints can find a stable position on their own. The design and material of the splint, and how many teeth it covers, are clinical decisions - not just comfort preferences.

Beyond symptom relief, a properly fitted splint is a diagnostic instrument. After four to six weeks of wearing a Michigan-style splint, the jaw settles into a stable, comfortable position in the joint, because your usual bite no longer forces it into place. That position becomes the target for any later treatment of the bite (occlusal rehabilitation). Without this step, crowns and other restorations may be made for a position the jaw has adapted to, rather than a natural one.

Patients who respond well to splint therapy typically describe a change they notice gradually: the morning ache they had lived with for years is gone. Chewing on both sides feels even. The jaw clicks less often, or stops clicking. This change is more than comfort: it is a clear sign that the jaw has found a position where muscle tension and joint load are balanced. It tells us that any bite treatment that follows can start from a stable jaw position.