In most cases, it is necessary to apply teeth whitening strips twice a day, for 30 minutes at a time. Results begin to show after around 4 days, and can last for a few months.
Teeth whitening is only recommended for people who have healthy teeth. This means they should not have holes that do not feature fillings. In addition to using teeth whitening strips, people who want to make their teeth whiter can use gels and pastes. Both solutions are also effective, as WebMD states.Learn more about Dental