Jan 15, 2025 cowrie Why Does My Tooth Hurt When I Bite Down? Causes and What to Do Tooth pain when biting down can signal a cracked tooth, decay, infection at the root, or bite misalignment. Learn what causes it, what to try first, and when to see a dentist. tooth-painbiting-paincracked-toothdental-symptomsperiapical-periodontitis →