My teeth keep getting more yellow even though I brush twice a day. Why won’t they stay white?

Toothpaste Problem: Abrasive Pastes and Misleading “Whitening” Claims
Not all toothpastes are created equal. Some whitening toothpastes contain abrasive particles that can wear down enamel, leading to increased yellowing over time.

Moreover, many over-the-counter whitening products offer limited results as they primarily remove surface stains without continue reading …