Frequent use of hair straightening chemicals and hair dyes has been found to increase the risk of breast cancer. For those who color their hair at least every 5-8 weeks, the risk of breast cancer is 60% higher than other women.
According to the research that 50.000 women were taken; women who use light colored hair dye have also increased the risk of developing breast cancer by 12%, and those who have used dark colored hair dye have not had the same risk. Among the participants of the study, it was found that women who used a type of hair straightening agent within 12 months had a higher risk of relative breast cancer at a rate of 31% than those who did not.
Although the use of semi-permanent dye is not associated with risk, the application of semi-permanent hair dye to the hair by a non-professional person has been associated with a 28% increased risk of breast cancer.
It is known that the formaldehyde in the content of chemical straighteners or its derivatives that react with keratin when heated is a known carcinogenic substance, and it was found that it poses a 27% higher risk for breast cancer in its application by a non-professional person.