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A 60-year-old male asked:

Hi doctors! is it ok to brush your teeth and/or use mouthwash before 1.....a colonoscopy and 2....before a fasting blood test? would the chemicals in the toothpaste would or would not affect either the colonoscopy or the fasting blood test?

1 doctor answer2 doctors weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
No: Brushing your teeth or using mouth wash will not affect colonoscopy or blood test results. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.

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Last updated Oct 24, 2020

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