In-office teeth whitening procedures use higher concentrations of bleaching agents than at-home whitening systems. Therefore, they are more likely to cause temporary tooth sensitivity and gum irritation. However, if done correctly by a qualified dentist, in-office teeth whitening is usually safe.

At-home teeth whitening systems use lower concentrations of bleaching agents than in-office treatments. Therefore, they are less likely to cause temporary tooth sensitivity and gum irritation. However, they may not be as effective as in-office treatments.

In-office teeth whitening can take anywhere from 30 minutes to an hour.

The actual time it takes will depend on the strength of the whitening solution that is used, as well as how stained your teeth are. Generally, the brighter and more yellow your teeth are, the longer it will take to achieve results.

Most in-office whitening treatments use a light activated bleaching gel which breaks down stains quickly. However, if your teeth are very stained or damaged, you may need to have a few treatments in order to achieve the desired results.

It depends on the product. In-office teeth whitening treatments tend to be more powerful and can lighten teeth up to eight shades in a single treatment. However, they can also be more expensive and are not always covered by dental insurance plans.

At-home teeth whitening products are typically less powerful than in-office treatments, but they are also much cheaper and can be used at home without having to visit a dentist. Most at-home whitening products use peroxide or other bleaching agents to remove stains from teeth, and they generally produce good results when used correctly.