The toothbrush moustache is a style of moustache in which the sides are vertical (or nearly so), often approximating the width of the nose and visually resembling the bristles on a toothbrush. First becoming popular in the United States in the late 19th century, it later spread to Germany and elsewhere. Comedians such as Charlie Chaplin and Oliver Hardy popularized it, reaching its heyday during the interwar years. By the end of World War II, the association with Nazi leader Adolf Hitler made it unfashionable, leading to it being colloquially termed the "Hitler moustache".
After World War II, toothbrush variants were worn by a small number of notable individuals, e.g. American real-estate developer Fred Trump (who wore a split variant), and former president of Zimbabwe Robert Mugabe (covering only the philtrum). Remaining strongly associated with Hitler over subsequent decades, it was used satirically in works of popular culture and political imagery, including motion pictures, comic books, and 1970s-era rock and roll.