Sodium bicarbonate can lift surface discolorations but does not bleach tooth color; use moderately

https://blogfreely.net/dernesvhbz/can-you-whiten-teeth-with-braces-a-guide-to-timing

Baking soda can raise surface spots however does not bleach tooth color; usage sparingly, and couple with fluoride toothpaste to secure enamel and enhance teeth.