Whitening Techniques 1. In the office, can be more easily controlled and monitored by a professional. This reduces the risk of patients selecting and using incorrect products, improper product use, inappropriate application procedures and effects of undiagnosed disease.2. Household bleach – easy to use, quick and cost effective. At-home teeth whitening methods include chewing gums, rinses, toothpastes, paint films, whitening strips, whitening pen, whitening gel, and laser teeth whitening. The effects of home and office whitening are temporary. Follow-up treatments are often necessary between one and three years. Both techniques are effective but results may vary depending on factors such as the type of stain, the age of the patient, the concentration of the bleach, and the duration and frequency of treatment. .ContraindicationsPre-existing sensitive teethAcid erosionBaring gums (gingival recession)Sensitive gumsSensitive to hydrogen peroxideFaulty dental restorationsPregnant or breastfeeding womenChildren under 16 years of age- Teeth whitening could irritate the pulp or make it sensitive because the pulp chambers are then large