What was Major cause of changes in style skin care and innovation of the beauty culture during the twentieth century?

The major cause of changes in skincare and the innovation of beauty culture during the twentieth century was the rise of consumerism and advancements in science and technology. The development of new synthetic ingredients and formulations, alongside increased marketing and advertising, transformed beauty products into desirable consumer goods. Additionally, the influence of social and cultural movements, including feminism and the shift in gender roles, encouraged diverse representations of beauty and a broader acceptance of various skincare practices. This period saw a shift from simple remedies to complex regimens, reflecting changing societal values and priorities regarding beauty and self-care.