In the 18th and 19th centuries, the wealthy had servants to shave them or could frequent barbershops. Daily shaving was not a widespread practice in the 19th century so some people never shaved. The custom of shaving every day among American men is a 20th-century innovation which was started after World War I. Men were required to shave daily so their gas masks would fit properly and this became much easier with the advent of the safety razor, which was standard issue during the war. In the 19th century, cutlers in Sheffield, England and Solingen, Germany produced a variety of razors.