If you think whitening your teeth at home is easy, cost-effective, and convenient, you’re right, it is. However, is it always the most effective way to do it? Definitely not. When buying teeth whitening kits from the drug store, you run the risk of not only harming your teeth but wasting valuable time and money, too. If you want to know more about the various mistakes you can make by using over-the-counter whitening kits, here are 4 common mistakes associated with teeth whitening and why there’s no better option than seeing a professional to get the job done.