The toothbrush moustache is a moustache style. The sides of the moustache are vertical (or nearly vertical) rather than tapered, giving the moustache hairs the appearance of toothbrush bristles that are attached to the nose. It was made famous by such comedians as Charlie Chaplin and Oliver Hardy. The style first became popular in the United States in the late 19th century—from there it spread to Germany and elsewhere—reaching a height of popularity in the inter-war years, before becoming unfashionable after World War II due to its strong association with German Nazi leader Adolf Hitler. The association was strong enough that the style also started to be called the "Hitler moustache".