You can usually keep a routine dental appointment with a mild cold, a runny nose or a slight cough, but you should call to reschedule if you have a fever, body aches, a productive cough or flu symptoms, both for your own comfort and to avoid passing on infection to staff and other patients. The one thing that decides whether you should go or reschedule is simple, do you have a fever. If yes, stay home. If it's just congestion with no fever, call ahead and let the practice make the call with you.
Key takeaways
- The main threshold for rescheduling is a fever, if you have one, call and reschedule rather than attending.
- Mild congestion or a runny nose with no fever is generally fine for a routine appointment, but lying back in the chair may be uncomfortable.
- Cold viruses are typically most contagious in the first 24 to 48 hours after symptoms start, and can remain contagious for up to a week.
- Always call ahead if you're unwell, practices can often adjust timing or protocol rather than cancelling outright.
- A genuine dental emergency, like severe pain or swelling, usually still needs to be assessed even if you're feeling unwell, call and describe your symptoms so the practice can advise.
- Routine cleans and cosmetic appointments are the easiest to reschedule, urgent problems like an abscess are not something to sit on.
The one rule that decides it: do you have a fever
Congestion alone doesn't usually stop a dental appointment going ahead. A fever does. If you have chills, body aches, a temperature, or you're coughing up mucus, that points to something more than a simple head cold and it's the point where most dental practices, including ours, would ask you to reschedule. It protects you from a longer, more uncomfortable appointment, and it protects staff and other patients from a virus that's likely still contagious.
Symptom-by-symptom decision guide
| Symptoms | What to do |
|---|---|
| Mild runny nose or slight congestion, no fever | Usually fine to attend, call ahead so the practice knows |
| Fever or chills | Reschedule, your appointment can be moved once you've recovered |
| Body aches and fatigue consistent with flu | Reschedule |
| Persistent coughing or sneezing | Call ahead, some practices will still see you with precautions, others will reschedule |
| Severe dental pain or swelling, even while unwell | Call the practice, an urgent problem usually still needs assessment |
Why dentists ask you to reschedule when you're genuinely sick
There are a few practical reasons beyond simple courtesy. Lying flat in a dental chair with a blocked nose is genuinely uncomfortable and can make it harder to breathe through procedures that involve water and suction. Dental treatment rooms are also close-contact environments, so infection control matters for staff and the patients booked in after you. If you're due for sedation or certain medications, being unwell can also change how your body responds, so it's worth mentioning it when you call. If dental anxiety is part of why you're weighing this up, our guide to dental sedation options for anxious adults covers what's available.
How long you're actually contagious for
Cold viruses are typically most contagious in the first 24 to 48 hours after symptoms appear, though you can remain contagious for up to a week in some cases. This is part of why practices ask about symptoms rather than just taking your word that you're "basically fine", the timing of your illness matters as much as how you currently feel. If your appointment is a routine clean rather than urgent treatment, our guide to hygienist versus dentist, what's the difference explains what a typical clean involves and why it's usually low-risk to simply push it back a week or two.
What to do if you have a dental emergency while sick
Being unwell doesn't make a genuine dental emergency wait. Severe, worsening pain, facial swelling, or a toothache that keeps you up at night usually needs assessment regardless of a cold or flu, because an infection left untreated can get worse quickly. Call the practice, describe both the dental symptoms and how unwell you're feeling, and they can advise whether to come in, adjust the appointment, or arrange treatment with appropriate precautions. Our guides on toothache that comes and goes and dry mouth, causes and treatment (useful if flu medication is drying out your mouth) cover related symptoms worth knowing about.
What actually happens if you reschedule
Rescheduling a routine dental appointment because you're unwell is a completely normal, low-friction thing to do, practices deal with it constantly, especially during cold and flu season. Call as early as you can once you know you won't be able to make it, and most practices will simply move you to the next available slot once you've recovered.
Frequently asked questions
Can I go to the dentist with just a runny nose?
Generally yes, if you have no fever and are otherwise feeling okay, a runny nose alone usually isn't a reason to reschedule, though it's still worth calling ahead.
Is it safe to have a filling done while I have a cold?
Usually yes if you have no fever, though congestion can make lying back for an extended procedure uncomfortable. If in doubt, ask the practice for their advice based on your specific symptoms.
How soon after flu symptoms clear up can I go to the dentist?
Once your fever has resolved and you're feeling well again, typically after the acute phase has passed, you can usually resume a normal appointment.
Will the dental practice know if I have a fever?
Most practices ask about symptoms when you call or check in, and some may ask you to confirm you're fever-free before a routine appointment.
Can a cold or flu affect how local anaesthetic works?
Congestion itself doesn't typically affect anaesthetic, but certain cold and flu medications can interact with some treatments, so it's worth mentioning anything you're taking.
Should I cancel a routine clean if I just have mild allergies, not a cold?
Allergy symptoms without a fever generally aren't a reason to cancel, since they aren't contagious, though ongoing congestion may still make the appointment less comfortable.
This article is general information and not a substitute for personal medical or dental advice. If you're due for a check-up or dealing with a dental concern, the Lumi team can help you work out the right timing, see our current deals or book with our general dentist in Melrose Park.
