If you grind or clench at night, a night guard is the first-line treatment to prevent tooth wear, cracks, and worsening jaw pain. But "night guard" covers a wide range of products — from a $20 boil-and-bite at the pharmacy to a $700 custom dental lab model. They are not equivalent. This guide compares the four main categories on protection, durability, comfort, and value.
For the broader picture, see the pillar: Teeth Grinding and Bruxism.
Key Facts (at a glance)
- Custom hard acrylic guards are the gold standard — best fit, best protection, last 5+ years.
- Soft guards are comfortable but can worsen grinding in heavy bruxers by giving them something to chew on.
- Boil-and-bite guards offer a middle ground — moderate protection, replace every 6–12 months.
- OTC stock guards offer the least protection and shortest lifespan; reasonable only as a 1-month bridge while waiting for a custom guard.
- Lab-made dual-arch guards (NTI, MCI) target specific bruxism patterns and require dentist evaluation.
Why protection matters
Bruxism forces can exceed 200 PSI — many times normal chewing force. Over years, this causes: - Enamel wear (flattening) - Tooth cracks - Failed restorations (crowns, fillings) - Cervical notches (V-shaped notches at the gumline from flexural stress) - Tooth mobility - Pulp damage - TMJ overload
A properly designed guard: - Distributes forces across many teeth instead of concentrating them - Allows controlled sliding so the joint isn't loaded statically - Provides a sacrificial wear surface that wears instead of teeth
The 4 main categories
1. Custom hard acrylic guard (dental lab)
How made: dentist takes an impression or digital scan, lab fabricates a guard from rigid acrylic (PMMA), fitted at a follow-up visit, occlusion adjusted to provide even contact.
Cost: $300–$700 typically; insurance often covers a portion
Lifespan: 5–10 years with normal use
Protection: highest — won't deform under bruxism forces
Comfort: initially feels bulky but adapts in 1–2 weeks; thin (1.5–2mm) at the chewing surface
Best for: anyone with documented bruxism, especially moderate-to-heavy grinders
2. Custom soft guard (dental lab)
How made: same impression/scan process, but fabricated from soft EVA (ethylene vinyl acetate)
Cost: $150–$400
Lifespan: 1–3 years; wear depends on bite force
Protection: moderate — protects against tooth wear but may worsen jaw muscle activity as the brain interprets the soft material as something to chew
Comfort: softest and most accepted by new wearers; ideal for sensitive teeth
Best for: mild grinders, clenchers with sensitive teeth, patients who can't tolerate hard guards initially
Caution: evidence increasingly shows soft guards aren't ideal for heavy bruxers — the squishy material reads as "food" to muscle reflexes and can elicit more clenching
3. Boil-and-bite guards (drugstore, $20–$60)
How made: thermoplastic material softened in boiling water, then bitten into to take a rough impression of your teeth
Cost: $20–$60
Lifespan: 3–12 months depending on grinding force and material
Protection: moderate-to-poor — fit is approximate, edges often irritate gums, material wears quickly
Comfort: variable — better after careful molding
Best for: short-term bridge while waiting for a custom guard; mild occasional grinders; clear evaluation of whether a custom guard is worth the investment
Brands worth considering: - Dr. Brux - Plackers Grind No More (single-use) - SmartGuard (with dental design intent) - The DenTek line (varies by model)
4. OTC stock guards ($5–$15)
How made: one-size pre-formed shape; no molding
Protection: minimal
Comfort: poor (no custom fit)
Recommendation: skip these — they don't fit well enough to protect reliably and often fall out at night.
Special designs (lab-made, dentist-prescribed)
NTI (Nociceptive Trigeminal Inhibition)
- Small, hard, fits only the upper front teeth
- Prevents the back teeth from making contact, reducing the temporalis muscle response
- Effective for some bruxers and migraine sufferers
- Risk: if worn long-term, posterior teeth can over-erupt — requires dental monitoring
- Cost: $400–$800
MCI / Anterior Bite Plane
- Similar concept; thinner profile in some designs
- Same posterior-eruption monitoring needed
Dual-arch full-coverage guards
- Cover all upper and lower teeth simultaneously
- Used in select TMJ-related cases
These designs require dentist evaluation; they're not interchangeable with standard guards.
