Teeth Hurt When Sick? How Illness Can Affect Your Oral Health
Ever noticed your teeth aching when you’ve got the flu, a sinus infection, or even COVID-19? You’re not imagining it—being unwell can genuinely affect your oral health. From sinus pressure to dehydration and even certain medications, illness can cause or worsen tooth pain in ways many Aussies don’t realise.
In this article, we’ll look at why your teeth might hurt when you’re sick, how different illnesses impact your mouth, and what you can do to prevent discomfort or long-term damage.
Why Do Your Teeth Hurt When You’re Sick?
There are several reasons your teeth or mouth might hurt when you’re crooked:
- Sinus pressure
- Dry mouth
- Dehydration
- Inflammation
- Teeth grinding (bruxism)
- Stomach acid or vomiting
- Infections reaching the mouth
Let’s take a closer look at how certain illnesses can cause oral discomfort.
1. Sinus Infections and Toothache
Sinus infections (or sinusitis) are a very common cause of upper tooth pain when you’re sick. The maxillary sinuses, which sit just above your upper molars, can become inflamed and put pressure on the tooth roots.
How it affects your teeth:
- Inflamed sinuses can press down on upper teeth, causing a dull ache or sensitivity.
- Pain is often felt in the back teeth.
- It may get worse when you lean forward or chew.
How to manage it:
- Use decongestants, saline sprays, or inhale steam to ease sinus pressure.
- Over-the-counter anti-inflammatories like ibuprofen can help reduce pain.
2. Fever and Dehydration
When you’re running a temperature or have gastro, it’s easy to become dehydrated—especially if you’re vomiting or have diarrhoea.
How it affects your teeth:
- Dehydration leads to dry mouth.
- Saliva helps wash away bacteria and neutralise acids in the mouth.
- A lack of saliva increases your risk of tooth decay, gum disease, and bad breath.
Tip:
Sip plenty of water or electrolyte drinks like Hydralyte, even if you’re not thirsty.
3. Sugary Medications and Mouth Health
Cough syrups and lozenges often contain sugar to make them taste better, but that sugar can hang around in your mouth, especially if taken before bed.
How it affects your teeth:
- Sugar feeds bacteria that lead to tooth decay.
- Constant exposure can cause cavities and enamel erosion.
What you can do:
- Rinse your mouth or brush your teeth after taking medicine.
- Ask your pharmacist about sugar-free options.
4. Vomiting and Stomach Acid
If you’ve got a tummy bug or food poisoning, vomiting exposes your teeth to strong stomach acids.
How it affects your teeth:
- Stomach acid can weaken your enamel.
- Over time, this leads to tooth sensitivity and erosion.
Important tip:
Don’t brush your teeth straight after vomiting—it can spread acid and wear down enamel. Rinse with water or a mix of water and baking soda, and wait at least 30 minutes before brushing.
5. COVID-19 and Oral Health
COVID-19 doesn’t just affect the lungs. Many people have reported oral issues during or after infection, including:
- Dry mouth
- Gum inflammation
- Mouth ulcers
- Cracked or sore teeth (possibly from clenching due to stress)
What you can do:
- Keep up your oral hygiene, even if you’re feeling flat.
- Stay well-hydrated.
- Chat to your dentist if symptoms persist after recovery.
6. Stress and Teeth Grinding
Being unwell can be stressful, especially if you’re worried about work, family, or ongoing symptoms. Stress is a major cause of teeth grinding or clenching, often while you sleep.
How it affects your teeth:
- Wears down enamel
- Causes jaw pain and headaches
- Can result in chipped or cracked teeth
Tips to prevent it:
- Use a night guard if you’re a known grinder.
- Practice stress relief techniques like deep breathing, gentle stretching, or meditation.
7. Slacking on Oral Care While Sick
Let’s be honest—when you’re curled up in bed with tissues and paracetamol, brushing your teeth probably isn’t a priority. But skipping your oral care, even for a day or two, can cause issues.
What might happen:
- Plaque and bacteria build up
- The risk of gum irritation or decay increases
- You may notice bad breath or a furry tongue.
Quick fix:
Even if you can only manage a quick brush once a day or a rinse with mouthwash, it’s better than doing nothing. Keep dental wipes or sugar-free gum handy if brushing feels like too much effort.
How to Look After Your Teeth When You’re Sick
Here’s how to give your teeth and gums a fighting chance when you’re not feeling 100%:
- Drink plenty of water – Aim to keep your mouth moist.
- Brush and floss – Even if it’s just once a day when you’re unwell.
- Choose alcohol-free mouthwash – It’s gentler on dry or inflamed gums.
- Rinse after vomiting – Use water or baking soda water to reduce acidity.
- Pick sugar-free meds – They’re easier on your teeth.
- Run a humidifier – Keeps air moist and reduces dry mouth.
- Wait before brushing post-vomit – Protect that enamel!
It’s Worth Seeing a Dentist After You’ve Recovered
While most oral discomfort caused by illness goes away on its own, it’s a smart idea to visit your dentist once you’re feeling better, especially if:
- You experienced a lingering toothache or gum pain
- You vomited frequently or had ongoing reflux
- You skipped your oral care routine for several days; you’d better have an oral examination.
- You noticed increased tooth sensitivity or bleeding gums
Even if the symptoms ease up, your teeth and gums might have taken a hit while you were crooked. A quick dental check-up can help spot any early signs of decay, enamel erosion, or gum issues—and get you back on track before things get worse.
Your dentist can:
- Check for any damage from acid or dry mouth
- Give your teeth a professional clean
- Offer tailored advice on protecting your teeth during future illnesses
Looking after your oral health is part of looking after your whole body. So once you’re back on your feet, book in a check-up—it’s better to be safe than sorry.
Final Thoughts
When you’re crooked, your oral health might not be at the front of your mind, but it should still be on the list. From sinus pressure to dehydration and sugar-packed medications, being sick can affect your teeth more than you think.
The good news? Most of the effects are temporary and can be managed with a bit of care. Drink plenty of water, rinse your mouth regularly, and brush at least once a day. And if the tooth pain doesn’t go away after you’re better, give your dentist a call.
FAQs
Q: Can having a cold or flu cause a toothache?
A: Yes—especially if your sinuses are inflamed, which can press on the roots of your upper teeth.
Q: My gums hurt when I’m sick. Why?
A: Dehydration, inflammation, and missing your brushing routine can all make your gums tender.
Q: Should I go to the dentist while I’m sick?
A: If you’ve got a mild cold, it’s best to reschedule. But if you have dental pain that doesn’t go away after recovery, see your dentist.
