Step 2. Try whitening toothpastes. Though heavily advertised, these only partially whiten teeth and don't provide a complete remedy. Make sure the toothpaste has the American Dental Association (ADA) seal of approval and has been clinically proved to whiten teeth effectively. Very few whitening toothpastes have undergone any type of clinical trial, and ones that are too abrasive can damage teeth or make them very sensitive.

Step2. 试试美白牙膏。虽然这类美白牙膏的广告很多，但它们通常只具备部分的美白功效而没有提供彻底的美白方案。确保你的牙膏通过了美国牙科协会（ADA）的认证标准，并经临床证明能够有效美白牙齿。很少有美白牙膏经过任何形式的临床试验，有些美白牙膏摩擦剂含量过多，会伤害你的牙齿或让你的牙齿变得过分敏感。