Night Guard and Tooth Sensitivity: Causes and Solutions

A properly fabricated night guard (occlusal splint) should not cause tooth sensitivity. If sensitivity develops, it indicates a fit, material, or usage issue.

Potential Mechanisms of Guard-Induced Sensitivity

• Improper fit: Excessive pressure on specific teeth → periodontal ligament inflammation, reversible pulpitis.
• Occlusal interference: Guard creates premature contact → hyperocclusion on certain teeth.
• Material allergy/irritation: Rare (acrylate sensitivity).
• Plaque accumulation: Poor hygiene under guard → gingivitis, root exposure, dentin hypersensitivity — not caused by the guard itself but by inadequate cleaning.
• Pre-existing conditions unmasked: Cracked tooth, caries, erosion, abfraction.

Solutions

1. Adjustment: Dentist evaluates occlusal contacts on guard; adjusts high spots.
2. Remake: New impression if fit fundamentally flawed.
3. Material change: Soft/dual-laminate vs. hard acrylic.
4. Hygiene protocol: Brush/floss before insertion; clean guard daily (soap/brush, not toothpaste); weekly soak (denture cleaner).
5. Desensitizing agents: Fluoride varnish, potassium nitrate toothpaste, oxalate gels.
6. Treat underlying pathology: Restore caries, crown cracked teeth, graft recession.

When to See Your Dentist

• Sensitivity persists >1–2 weeks after delivery/adjustment.
• Pain on biting, spontaneous ache, thermal linger.
• Guard feels tight, loose, or causes jaw pain/TMJ symptoms.

Night guards protect teeth from bruxism damage. Sensitivity is a fixable side effect, not an inevitable outcome.