@olaplex was the first bond builder product EVER....and many patents. Olaplex n°3 is so awesome...it’s a pretreatment (to strengthen hair) put on damp or dry hair ...leave on for 20 minutes (or more) after use your favorite shampoo n°4 and conditioner n°5 (If your hair needs a good deep conditioner then get out of the shower and leave on your conditioner for at least 10minutes)