Teeth whitening trays and gels are very effective, but the desired results take longer to achieve. These clear trays are usually worn during the day or overnight and can take anywhere from 3 days to 2 weeks before results are achieved.
Teeth whitening kits from the dental professional produce faster and more effective results because they contain a stronger peroxide-whitening agent than whitening kits purchased over the counter. Another benefit of trays and gels from the dental professional is that the trays are custom made and fit your teeth exactly. Clinical studies support the safety and effectiveness of home-use bleaching gels when used properly. Tooth sensitivity and irritation to soft tissues can occur during whitening treatment, but these effects are temporary.