True or false? Let's test your hair knowledge.

False. Hair grows from the follicle in your scalp, so your ends have no say in how fast it grows. Regular trims can, however, prevent split ends from travelling further up the hair. 

False. Your shampoo doesn't suddenly stop working because your hair got bored of it. But your hair, scalp, routine and environment can change, which might mean your shampoo needs to change too. 

True. Hormones, age, environment and even certain medications can affect how your hair grows and behaves. 

Kind of. Cold water isn't a magic shine button. Any smoothing effect is modest; your hair's condition and the products you use matter much more. 

False. Products can temporarily smooth and seal the appearance of split ends, but once a strand has split, only a haircut can truly remove it. Sorry. 

True. The hair you can see is mostly made up of keratinised cells that are no longer living. The living action happens inside the follicle. Which is also why your haircut doesn't hurt - thankfully.