To protect your teeth and relax your jaw, ensure you maintain a small resting space of 2 to 4 mm (called the "freeway space") between your upper and lower teeth. Constant dental contact unnecessarily fatigues the jaw muscles and can cause clenching.

noli's read

The principle of a resting space between the upper and lower teeth is a fundamental anatomical concept widely validated by science (evidence: specialist consensus and clinical guidelines, such as the reference work by Boucher). Observational data confirm that at complete rest, teeth should not touch in order to allow the masticatory muscles to relax. If this space disappears due to continuous clenching during the day, it maintains a permanent tension that can fatigue the jaw and wear down enamel in the long term. Clinical studies (notably those conducted by the team of researcher Frank Lobbezoo) show that becoming aware of these contacts is, moreover, an excellent method of self-observation for reducing this physical stress. Nevertheless, the assertion that one damages one's teeth "even while doing nothing" is slightly exaggerated: our body possesses a good capacity for adaptation, and the resting space varies naturally between individuals without being fixed to an absolute measurement.

the sources

No named source held this one up — that absence is part of the verdict.