Bicarbonate of soda for teeth stains

Bicarbonate of soda may scrub some surface stain, but it cannot bleach enamel or remove tartar, and frequent use can irritate gums or wear enamel.

It is sodium bicarbonate, a mildly abrasive alkaline powder. External pigments sit on the acquired pellicle, while intrinsic colour lies within enamel or dentine.

Use fluoride toothpaste, a soft brush, and gentle pressure. A hygienist can remove calculus with hand instruments or an ultrasonic scaler.

See a dentist for marks that persist, bleeding, sensitivity, decay, or a single tooth that darkens. Swelling, fever, or severe pain needs urgent care.

Ask whether the mark is external or intrinsic, whether enamel or decay is involved, and whether cleaning or whitening is appropriate.