Hair Growth Stages.

Hair grows in three main stages.
Anagen-is the active stage of hair growth that can last from 2 to 8 years.

Catagen-is a transition stage that lasts anywhere from 2 to 4 weeks where there is no growth at all.

Telogen-is when the hair is resting, and can last up to 5 months. At the end of this stage the hair will fall and a new hair will start to grow. Normally 85 to 90% of the hair on the scalp is actively growing. If a hair follicle is destroyed, hair will no longer grow from that follicle.