Reverse the early stages of enamel erosion at home with the Regenerate Boosting Serum Refill Set 2 x 16ml. The Regenerate Boosting Serum helps to boost the effectiveness of your Regenerate Advanced Toothpaste by 43%*, maximising the power of enamel mineral regeneration**. An easy way to keep your teeth strong & healthy, the Boosting Serum Refill Set contains one NR-5 Serum & one Activator Gel, designed to be used in conjunction with a mouth tray from the complete Advanced Enamel Serum pack. Use the Boosting Serum monthly, for three days. Apply a single thin layer of the NR-5 (TM) Serum in the mouth tray. On top of the serum layer the activator gel & mix both together using the mixing stick included. Begin the application in the dental arch of the upper jaw & insert the mouth tray for 3 minutes. Once the application is over, remove the mouth tray & gently rinse the mouth with water to remove any excess product. ** As demonstrated in a 3 day in vitro test measuring enamel micro hardness: combined used of Advanced Toothpaste & Boosting Serum vs Advanced Toothpaste only. * Acts on early invisible stages of enamel erosion. Helps to regenerate enamel by restoring its mineral content & micro hardness with regular use. Clinically proven. Does not contain mouth tray.