No one likes to talk about dandruff - it's embarrassing, right? Well, there's no point feeling awkward about it, dandruff has been an annoyance for all ages since the dawn of time. In medieval times there were various remedies to treat the ailment, including a recipe for a hair tonic including beetroot, vinegar, water, cleavers galium aparine (a type of leaf), and the bark of a willow tree.