Bond Filler is a concentrated treatment that stabilises the bonds after treatment with PlexForte N1 (Bond Booster). Not only does it stabilise the increase in force but it also nourishes with essential amino acids and seals the structure to ensure a longer duration of the technical process. Use Bond Filler as maintenance at house to create new bonds between proteins that strengthen and protect the inside of the hair structure (or cortex), thus guaranteeing a longer duration of the technical process. Repairs and deeply nourishes the hair fibre in damaged hair, rejuvenating its appearance from the first application.