D.K.
Back in the 80's, when I wore braces, and before whitening products were accessible on the market, my orthodontist recommended a paste made with baking soda and hydrogen peroxide. It really helped me maintain sparkling teeth because I was concerned that wearing my braces for 2 years (with bands around EVERY tooth---even the front ones!)might leave stains. I religiously cleaned my teeth with a waterpick appliance (anyone remember those?) and used the homemade paste. It works wonders! He cautioned against using it more than a couple times a week because the peroxide can damage the tooth enamel. Good luck!