Replacing a Brush After Illness
Short answer. There is no need to replace your toothbrush after every minor cold, but many people choose to replace after illness once they feel better, especially if the brush was stored touching others. Replace sooner after a more serious infection if your dentist or doctor suggests it.
- A minor cold rarely calls for a new brush, but a fresh one is a harmless choice.
- Keep brushes apart so heads never touch.
- Do not share brushes, even when well.
- Ask a dentist or doctor if you have a condition or a weakened immune system.
Do you really need a new brush?
Advice here is cautious rather than strict. Many dental sources say there is little evidence that a brush used during a minor cold keeps you ill, since you are mostly exposed to germs you already have. Even so, plenty of people feel better with a fresh brush once they have recovered.
The practical view is that a replacement costs little and removes any doubt. If you replace after illness, do it when symptoms have settled, so you do not use the new brush while you are still unwell.
When replacing sooner makes sense
A new brush is more worth considering after a throat infection, a mouth infection or a stomach illness, or when the brush has been stored touching another person's. It is also sensible if someone with a weakened immune system lives in the household.
If you have a medical condition or take medicines that affect your immunity, ask your doctor or dentist what they suggest. They know your situation, and general advice on a website cannot replace theirs.
- After a throat or mouth infection
- After a stomach illness
- If heads were touching in a shared holder
- If someone in the home has a weakened immune system
What not to do with the old brush
You may see tips about boiling, microwaving or soaking a brush in strong solutions. These tend to damage bristles and handles and are not what dental organisations generally advise. A brush that has been through that is likely to wear out faster.
Rinsing thoroughly under running tap water after each use, and letting the brush dry, is the usual recommendation. If you want certainty after illness, replacing the brush is simpler and more reliable than trying to sterilise it at home.
Keeping the household apart
The best way to avoid passing anything on is to keep brushes separate every day, not just when someone is ill. Heads should not touch, and no one should borrow another person's brush, even briefly.
If several people share a bathroom, a holder with separate slots helps. During an illness you might keep the sick person's brush a little further away. Once they recover and replace after illness, the holder can be washed with warm soapy water too.
A simple plan for next time
Once you feel well, swap your brush and wash the holder or cup. Keep a spare in a cupboard so you are never tempted to carry on with an old one. That way the decision takes thirty seconds.
If your symptoms include a mouth sore that does not heal, swelling, persistent pain or a bad taste that does not clear up, see a dentist or doctor rather than relying on a new toothbrush. A fresh brush supports your routine but does not treat anything.
Questions readers ask
Should I replace my brush at the start of a cold or after it?
After, once you are feeling better. A new brush used while you are still unwell could simply pick up the same germs again.
Does an electric brush head need the same treatment?
Yes, the head can be swapped after illness just like a manual brush. The handle can be wiped with a damp cloth, but check your maker's instructions first.
Is it fine to share a brush with a partner if we are both ill?
It is best not to. Sharing brushes is generally discouraged whether or not anyone is unwell, so keep them separate.
Talk to a professional. Persistent bleeding, pain, swelling, loose teeth or sores that do not heal need a dentist's attention, not a supplement.