This hair straightening system, unlike the Brazilian Keratin Straightening, does not contain formaldehyde according to the manufacturer. However, it does contain aldehydes. Are aldehydes as noxious to the resperatory system and hair follicles as formaldehyde? I have had two Coppola treatments and loved the results however about eight months after my last treatment I noticed that the hair in my hairline only grows to about 3-4 inches. I don't know if this a coincidence or if I suffered follicular damage. I am in good health and have not suffered hair loss. Any insight would be appreciated.