The toothbrush moustache is a style of moustache in which the sides are vertical (or nearly vertical) rather than tapered, giving the hairs the appearance of the bristles on a toothbrush 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 interwar years, before becoming unfashionable after World War II due to its strong association with Nazi leader Adolf Hitler. The association has become strong enough that the toothbrush has also become known as the "Hitler moustache".
In the post-war years, the style was worn by some notable individuals, including several Israeli politicians and American real-estate developer Fred Trump. Since the immediate post-war years, it has also appeared in works of popular culture including films, cartoons, and comedy, as well as political imagery—usually explicitly eliciting the association with Hitler.