Nu Radiance Duet Duet’s dual barrel syringe system perfectly blends carbamide peroxide and a water based activator for fast whitening and to eliminate fluid movement, preventing the onset of sensitivity. This advanced dental product is ideal for people who may suffer from tooth sensitivity. • 30 Minute Treatments • High Water Content • High pH • No Fadeback You will get enough gel for a full course of treatment. If you do not have mouth trays then please see our mouth tray section. We supply them from only £6.99 Only £27.99 for a (4) Pack (large tubes) with Free UK Delivery.