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 and healthy the boosting serum refill set contains one nr 5 serum and one activator gel designed to be used in conjunction with a mouth tray from the complete advanced enamel serum pack