OLAPLEX N0.3 Bond Perfector is designed for at-home use to maintain healthy hair in between services. OLAPLEX is a 5 Part System. N0.1 and N0.2 are our in-salon services that leave your hair beautiful and healthy. N0.3 is your insurance outside the salon against hair damage caused by thermal and mechanical styling. Just use the OLAPLEX N0.3 once every week to ensure optimum hair health between salon visits.