If you have overly sensitive teeth, do not use this product. This toothpaste is fairly strong. Have noticed my teeth being a few shades lighter after three weeks of continuous use twice daily. If you consume a lot of dark foods and drinks, this product will still work; however your teeth will blend between white and yellow. The results definitely won't be as great.
You can still enjoy dark foods, but don't consume such on a daily basis while using this product.