Hair Perfector No.3 is for use at home once a week to strengthen hair further or to use as a pre-treatment to a future chemical service. Created out of a demand for clients wanting to take a little Olaplex home with them, Olaplex created a small 3.3oz (100ml) bottle of the Hair Perfector. The No. 3 Hair Perfector will maintain strength, structure, integrity, softness and shine leading up to the clients next service at the salon. Olaplex is a scientifically proven 3 step Professional Service that celebrity stylists and stylists around the world rave helps them stengthen hair, prevent breakage, go blonder and push the envelope further without compromising the integrity of the hair. A single active ingredient OLAPLEX was designed to reconnect the disulfide bonds broken by the process of permanent hair coloring and lightening. Olaplex is free of silicones, oils, aldehydes, parabens, gluten.