Opalescence Teeth Whitening syringes are for patients who have custom whitening trays or clear aligners. They are available in a variety of concentrations, and wear time will vary depending on the concentration. Opalescence gel is a more viscous formula compared to other teeth whitening brands and will not leak out of whitening trays. Dr. Hoyt prescribes the concentration amount and duration of wear according to each patient’s needs. From a 10% carbamide peroxide gel that can be worn 8-10 hours at nighttime to a 45% gel that is only worn for 15 minutes, we will find the best option for each patient to achieve their whitening goals at home. This option is truly customized whitening.