Many patients are told not to eat or drink before surgery, which often leads to another question: Can I still brush my teeth?
In most cases, the answer is yes. Brushing your teeth is usually encouraged before surgery, as long as you avoid swallowing water or toothpaste and follow any specific instructions from your surgeon or anesthesiologist.
Quick Summary
For most surgeries:
- You can usually brush your teeth the morning of surgery.
- Do not swallow water or toothpaste.
- Spit everything out completely.
- Avoid chewing gum or sucking on mints unless your care team says they're allowed.
- Always follow the fasting instructions provided by your surgeon or anesthesia team.
For a complete overview of preparing for surgery, see How to Prepare for Surgery.
Why Can You Brush Your Teeth?
The purpose of fasting before surgery is to reduce the risk of stomach contents entering your lungs while you're under anesthesia.
Brushing your teeth does not usually increase this risk because you're not eating or drinking—you are simply cleaning your mouth.
Good oral hygiene can also help you feel more comfortable before surgery.
Should I Swallow Any Water?
No.
When brushing your teeth before surgery:
- Use only a small amount of water.
- Spit the water out completely.
- Avoid swallowing toothpaste or water.
If you're unsure about your instructions, ask your surgical team before the day of surgery.
What If I Accidentally Swallow Some Water?
A very small accidental swallow while brushing your teeth is usually not a problem, but you should let your surgical team know when you arrive.
Do not assume your surgery will automatically be canceled. Your care team can decide whether any changes are necessary based on your procedure and the amount swallowed.
What About Mouthwash?
Many surgery centers recommend avoiding mouthwash if it could be swallowed.
If you choose to use mouthwash, spit it out completely and avoid swallowing any liquid.
When in doubt, skip it and simply brush your teeth.
Can I Chew Gum or Eat Breath Mints?
Usually not.
Chewing gum, sucking on mints, or eating candy may stimulate stomach secretions and may not be allowed during your fasting period.
Unless your surgical team specifically says otherwise, avoid all gum, mints, and candy before surgery.
What If My Instructions Say Nothing by Mouth?
Many patients worry that brushing their teeth violates a "nothing by mouth" instruction.
In most cases, brushing your teeth without swallowing water is still permitted, but your surgeon's instructions always take priority.
If your instructions differ from the general guidance, follow your surgeon's recommendations.
The Bottom Line
For most patients, brushing your teeth before surgery is safe and encouraged, provided you do not swallow water or toothpaste.
If you have any questions about fasting instructions, ask your surgeon or anesthesia team before the day of surgery so you know exactly what is expected.
For a complete pre-surgery checklist, review the Surgery Preparation Checklist – Free PDF.
Related Guides
