Sodium bicarbonate can lift surface discolorations however does not bleach tooth color; use moderately
https://www.mediafire.com/file/fp1rqz2iiwkheaf/pdf-41481-54141.pdf/file
Sodium bicarbonate can lift surface area spots however does not bleach tooth color; use moderately, and couple with fluoride toothpaste to protect enamel and reinforce teeth.