Once a month? Once a week? Every few months? The honest answer depends on your scalp. Here's how we think about treatment frequency at Cosh, and how to figure out what's right for you.

Most people reach for the same dandruff shampoo and wonder why it never quite works. The answer is usually simple: flaky scalp has more than one cause, and they each need something different. Here's how to tell what your scalp is actually telling you.