Hair fibers are not alive and do not self-repair; the tips are most prone to damage from environmental exposure, heat treatments, and chemical processes.

“the hair doesn't self repair it's a keratin fiber right that your body has produced it's not alive so if when the fiber is long that means it's been around a long time and so the tips of the hair is the part where you're gonna see a fraying of the hair right it's the part that looks the driest it was the part that's been had the most exposure to UV radiation and everything else a heat or if you've done a Brazilian Blowout or some other straightening treatment or curling treatment or colouring treatment the part that has received the most amount of abuse is the tips”