What's the difference between a bond builder like Olaplex No.3 and a regular deep conditioner?

Bond builders such as Olaplex No.3 Plus use specific chemistry (bis-aminopropyl diglycol dimaleate) that targets broken disulfide bonds inside the hair shaft, while traditional deep conditioners coat the cuticle with oils, proteins, and humectants to improve softness and slip. Specialist subreddits note that bond builders are most useful after chemical damage (bleach, relaxer, perm), whereas moisture masks are the right pick for everyday dryness and frizz.