Night Guards for Grinding: Hard, Soft and Sleep Apnoea

What occlusal guard involves

An occlusal guard is a custom appliance worn over the teeth, almost always at night, to absorb the force of grinding and clenching. Bruxism generates forces far beyond normal chewing and does so for hours while the patient is unconscious of it, producing worn-down teeth, cracked cusps, fractured restorations, sensitivity, morning jaw ache and headaches. The guard does not stop the grinding. It gives the grinding something expendable to happen against — a piece of acrylic that can be replaced for a few hundred rather than enamel, crowns and cracked molars that cannot.

When this treatment is used

Prescribed where there is evidence of grinding: measurable wear facets, fractured restorations, a partner reporting the noise, morning jaw stiffness, or repeated failure of porcelain restorations. Also used protectively after substantial restorative work in a patient known to grind.

Hard, soft, and why it matters

A hard acrylic full-arch guard (D9944) is the standard for genuine bruxism. It resists wear, does not encourage clenching, and can be precisely adjusted so the bite is even across it. A soft guard (D9945) is more comfortable and cheaper, but for many heavy grinders it acts like a chew toy — the springiness invites more muscle activity, and it wears through quickly. Soft guards have their place for mild cases, for short-term protection, and for patients who cannot tolerate hard acrylic. Dual-laminate guards — soft inside, hard outside — are a reasonable compromise. For an established grinder with worn teeth and cracked restorations, hard acrylic is the appropriate prescription. What matters as much as the material is the fit and the adjustment. A guard that has not been adjusted so the teeth meet evenly on it can cause more problems than it solves, and a boil-and-bite guard from a pharmacy is adjusted to nothing.

The sleep apnoea question

Bruxism and obstructive sleep apnoea are associated, and grinding is sometimes a manifestation of disturbed sleep rather than a primary problem. That matters because a conventional occlusal guard can, in some patients, make apnoea worse by slightly restricting the airway. Anyone with loud snoring, witnessed pauses in breathing, unrefreshing sleep or daytime sleepiness alongside their grinding should be assessed for sleep-disordered breathing before a guard is made. In those cases a mandibular advancement appliance — which protrudes the lower jaw to open the airway — may be the better appliance, and it addresses both problems.

Costs and insurance in summary

Typical fee range across the group: $0–$0 where a single band applies. Several codes here are priced individually and carry their own range on their own page. Custom guards cost considerably more than pharmacy versions, and the difference is fit and adjustment rather than material alone.

Benefit category: Adjunctive, 0–50% on a typical plan. Coverage varies widely. Some plans pay guards at the basic or major rate with a frequency limit; others exclude them as they exclude TMD treatment generally.

Common restrictions: Frequently excluded along with TMD benefits; Where covered, usually limited to once every 2–5 years; A narrative documenting wear or fractured restorations helps; Guards for sports protection are a different code and usually excluded.