Thicken Hair NYC - (212) 644-9494 - New York, NY

Avoid harsh chemicals, avoid the chemicals that are often found in coloring agents, treat your hair gently
Avoid traction ie pulling on the hair shafts by pulling the hair back, used soft gentle approach to brushing with wide tooth combs
Do not over wash, do not over condition and do not over treat with hair products, sprays, and gels.
Following up with a Dermatologist.
If you have sufficient density in the back of the scalp, you may benefit from a hair transplant moving those hairs to the front where the density is thinner.