My dentist whitened my teeth with 30% hydrogen peroxide. during treatment, i felt increased brain fog and concentration issues. and my throat was sore so i know i swallowed some. the brain issues persist weeks later. can hydrogen peroxide cause this?

The whitening treatment should not cause brain fog or concentration issues. There must be something else causing your problems. Please see your physician.

Swallowing a small amount of hydrogen peroxide can cause a slight caustic injury with oxygen gas formation and lipid peroxidation. The small amount you swallowed could give you only a slight sore throat. Nothing to do with brain fog. See your doctor for a possible referral to a neurologist if these issues persist.