Which hair styling tool was also invented by Max Factor?

Max Factor, a pivotal figure in the beauty industry, is credited with the invention of the curling iron. His work in cosmetics led to many innovations that enhanced beauty techniques, including tools that revolutionized hair styling. The curling iron's design allows hair to be shaped into curls or waves, which was a significant advancement in the pursuit of varied hairstyles. This particular tool is directly associated with Max Factor's contributions to hair and beauty, making it the correct choice.

While hair dryers, flat irons, and hair straightening brushes have their own unique histories and have contributed significantly to hair styling, they are not linked to Max Factor's innovations in the same way as the curling iron. Each of those tools serves a different purpose in hair styling, but the curling iron stands out as a direct result of Factor's creativity and influence in the cosmetics industry.