Here's how hay fever can hurt your teeth:
• Dry mouth. You're more likely to breathe through your mouth when your nose is clogged up. That can dry up saliva, putting your teeth are higher risk for cavities. Saliva helps digest food, wash away food particles and neutralize acidity. Antihistamines can also contribute to dry mouth.
• Tooth pain. Feel an ache in an upper tooth? Allergies may be to blame. Sinus congestion in the cavity above the mouth can put pressure on your tooth roots, causing phantom toothache.
• Bad breath. The increase in bacteria associated with post-nasal drip, a common allergy symptom, can lead to bad breath.