Armpit and leg hair have their perks, serving as barriers against bacteria and friction, reducing infections, and even releasing pheromones that attract others (via Healthline). However ...

One popular style – half-up half-down hair – has also been trickling back into the rotation, favoured by women of the moment Hailey Bieber, Jennifer Lopez, Sydney Sweeney, Rihanna and HoYeon Jung.

No two heads of curls are exactly alike. While some are more coily and springy, others are a soft wave, and, of course, there's everything in between. Then, there are hair textures that are almost ...