Who invented the first straightening comb in the world?

The first straightening comb is attributed to Madam C.J. Walker, an African American entrepreneur and philanthropist, who patented a version of the heated straightening comb in 1909. However, the concept of heated combs for hair straightening existed before her patent, with various forms used in different cultures. Madam C.J. Walker is often credited with popularizing the use of the heated comb in the African American community, significantly impacting hair care practices.