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. 試試美白牙膏。雖然這類美白牙膏的廣告很多，但它們通常只具備部分的美白功效而沒有提供徹底的美白方案。確保你的牙膏通過了美國牙科協會（ADA）的認證標準，并經臨床證明能夠有效美白牙齒。很少有美白牙膏經過任何形式的臨床試驗，有些美白牙膏摩擦劑含量過多，會傷害你的牙齒或讓你的牙齒變得過分敏感。