Baking soda can lift surface stains but does not bleach tooth color; usage sparingly
https://www.mediafire.com/file/09bysq6f7vq1hxg/pdf-56509-33817.pdf/file
Baking soda can raise surface discolorations however does not bleach tooth color; use moderately, and pair with fluoride tooth paste to protect enamel and strengthen teeth.