Is It Safe to Swish with Hydrogen Peroxide to Whiten Teeth?

But it won't really do much.  While many people swish with hydrogen peroxide to treat their periodontal issues, the teeth won't get very white as a result.  There are some key factors at play, explained in the link:

You should never rinse with hydrogen peroxide to whiten your teeth!  This will not only not whiten your teeth, but you can do significant damage to your gums and lining of your mouth.  You can also disrupt the normal flora of bacteria in your mouth.  If you want to whiten please see your dentist for options.   

Thank you for asking a great question. 3% Peroxide is ok to use occasionally, but  whitening of the teeth will take some time. Professonal whitening systems do it much faster and more predictably.All the best to you.

Hydrogen peroxide is a bleaching agent, but using a medical grade solution, more than 3% won't do you or your teeth much good. Your teeth will whiten over time, but it could take months, or even years, before they will get brighter. Your best defense against stained and discolored teeth is a professional tooth whitening appointment. Our practice uses a few different professional tooth whitening procedures including Zoom!, which is a chairside whitening treatment that will give you whiter teeth in a single dental appointment. Good luck with your professional tooth whitening treatment!

I have to be careful here when I say most products that are available for rinsing with that have hydrogen peroxide, do no have a very high percentage. On the internet all manner of products are available, so I can not assume that the percentage is low (and therefore safe).Standard mouth rinses like Peroxyl may help with superficial stain. However this has a strong oxidising effect spread over your soft tissues. I would not recommend you to use this daily and permanently. Your dentist can provide in chair or home-trays to get an excellent whitening result that is safe.Good luck and hope you have successful whitening. Kind regardsThomas Dey, BDS, MSc