Hair Perfector as part of the Olaplex professional use system.
Use once a week to strengthen damaged hair or use the day before as a pre treatment to any chemical service.
Directions of use:
1. Apply a generous amount from roots to ends on unwashed towel dried hair. Comb through once. Leave on for 10 minutes or more. For damaged hair, repeat without rinsing.
2. Rinse from hair, shampoo and condition.