When you have a cold, your teeth often hurt because the infection and congestion in your sinuses and mouth put extra pressure and strain on the nerves around your upper teeth, making them feel sore or achy.

What’s really going on

When you’re sick with a cold, several things can team up to make your teeth hurt:

  • Sinus pressure on tooth roots:
    Your maxillary sinuses sit right above your upper back teeth. When they get inflamed and filled with mucus, the pressure can press on the tooth roots and create a dull, throbbing ache that can feel like several teeth hurt at once.
  • Nasal congestion and mouth breathing:
    A stuffy nose makes you breathe through your mouth more, which dries out your mouth and reduces protective saliva, leading to irritation of teeth and gums and making them more sensitive.
  • Increased sensitivity:
    Cold air, cold drinks, and temperature changes hit already-irritated teeth and exposed surfaces, so sensations that normally wouldn’t bother you suddenly feel sharp or uncomfortable.
  • Tooth grinding and clenching:
    When you’re sick, stressed, or not sleeping well, you may clench or grind your teeth (often without realizing it), which overworks the teeth and jaw muscles and can cause soreness or tooth pain.
  • Dehydration and dry mouth from illness or meds:
    Fever, not drinking enough, and cold or flu medications that dry out your nose and mouth can reduce saliva, increase plaque buildup, and irritate gums, which can feel like toothache.
  • Existing dental problems flaring up:
    If you already have cavities, gum disease, or cracked teeth, the extra inflammation and pressure during a cold can make those issues hurt more, so what feels like “cold tooth pain” can actually be an underlying dental problem showing itself.

Think of it like this: your sinuses, nerves, and teeth share the same neighborhood. When the sinuses get inflamed and crowded, the teeth are the unlucky neighbors who feel the pressure.

When it’s probably “just” the cold

Tooth pain is more likely tied to your cold or sinus issue (rather than a serious tooth problem) if you notice:

  • Pain mainly in the upper back teeth on both sides.
  • A dull, pressure-like ache that worsens when you bend forward, lie down, or blow your nose.
  • Pain that improves as your congestion and cold symptoms start to clear.

In these cases, treating the cold and sinus congestion usually helps the tooth pain fade too.

When to worry and see a dentist or doctor

You should get checked by a dentist or doctor if:

  1. Tooth pain is sharp, one-sided, or focused on one specific tooth.
    This can signal a cavity, cracked tooth, or nerve inflammation rather than just sinus pressure.
  1. Pain lingers after the cold is gone.
    If your cold clears but the toothache stays more than a few days, that’s a red flag for a dental issue.
  1. You have severe pain, swelling, or fever focused around the jaw or a tooth.
    That could indicate an infection that needs urgent treatment.
  1. Chewing or biting makes one area much more painful.
    This often points to a dental problem rather than general sinus pressure.

If you’re ever unsure, it’s safer to call a dentist or your doctor and describe your symptoms; they can help decide whether it sounds like sinus- related pain or a true dental emergency.

Simple ways to feel better at home

For mild tooth pain that seems clearly linked to a cold:

  • Decongest and reduce sinus pressure:
    Use saline nasal rinses or sprays, warm compresses over your cheeks and nose, and recommended cold/sinus medications (as appropriate for you) to open your sinuses and reduce pressure on tooth roots.
  • Stay hydrated:
    Sip water regularly, herbal teas, and clear fluids to fight dehydration and dry mouth, and to help your body clear mucus.
  • Protect your teeth from extremes:
    Avoid very cold drinks and icy air directly on your teeth; go for lukewarm fluids and gently cover your mouth and nose when you go outside in cold weather.
  • Keep up gentle oral care:
    Brush and floss gently but consistently, even when you feel lousy, to prevent plaque buildup on already sensitive teeth.
  • Manage grinding:
    If you wake with jaw soreness or a headache, you might be clenching; relaxing your jaw before bed and, if needed, using a night guard (from your dentist) can help.
  • Use pain relief if appropriate:
    Over-the-counter pain relievers (like ibuprofen or acetaminophen, if safe for you) can ease both the cold symptoms and tooth pain, but follow dosage instructions and ask a professional if you’re unsure.

Bottom line: Your teeth usually hurt during a cold because sinus congestion, dry mouth, and muscle tension all stress the nerves around your upper teeth, making them feel sore until the infection and inflammation calm down.

Information gathered from public forums or data available on the internet and portrayed here.