Any kind of strips--I prefer Crest or Rembrandt--that are left on your teeth for a certain length of time and then removed. They can get pricey but they are worth it. When it comes to whitening toothpastes, if you're using them by themselves, you're probably NOT going to see results. You should use them in combination with the strips and/or other whitening products. Why? Whitening toothpastes are made with the necessary ingredients to whiten teeth but most people brush, rinse, and go about their day. The whitening agents in the toothpaste end up not being on your teeth long enough..Not even close! You can try to use just toothpaste, but personally, I wouldn't waste my money.