Very few people have naturally brilliantly white teeth as the color of a person’s teeth is influenced by many different factors. Foods and drinks such as teas and coffees may stain teeth, in addition to age yellowing the teeth over time. Professional teeth whitening is the most powerful treatment you can get to lighten your teeth as much as possible.

According to the FDA, the term “bleaching” is permitted to be used only when the teeth can be whitened beyond their natural color. This applies strictly to products that contain bleach — typically hydrogen peroxide or carbamide peroxide.

The term “whitening” on the other hand, refers to restoring a tooth’s surface color by removing dirt and debris. So technically speaking, any product used to clean the teeth (like toothpaste) is considered a whitener. Of course, the term whitening sounds better than bleaching, so it is more frequently used — even when describing products that contain bleach.

The bleach preference for in-office whitening, where time is limited, is powerful and fast-acting hydrogen peroxide. When used in bleaching teeth, hydrogen peroxide concentrations range from approximately 9% to 40%.

By contrast, the bleach preference for at-home teeth whitening is slower-acting carbamide peroxide, which breaks down into hydrogen peroxide. Carbamide peroxide has about a third of the strength of hydrogen peroxide. This means that a 15% solution of carbamide peroxide is the rough equivalent of a 5% solution of hydrogen peroxide.