Question: what is the difference between olaplex number 2 and 3?
Answer: The at-home treatment is a less potent version of the salon-exclusive No. 2 that can be used every 10 days to resuscitate dry, damaged hair. According to Olaplex's vice president of education, Slim (just Slim, like the Beyoncé of colour care), No. 2 is a 15% concentrate whereas No. 3 is 12.5%.