Gillette became a billionaire

Competitors worked hard to steal King's ideas and circumvent their patents. He then invested a lot of money and time in legal proceedings to defend his rights. When King was 55 years old, in 1910, his company began to rule the safety industry, and he rose to the status of a successful businessman.

Gillette traveled to England after resigning as president. Gillette Safety Razor Company benefited greatly from World War I. All recruits received Gillette shaving kits along with their uniforms and weapons before the end of 1917. Christine Chen and Tim Carvell further stated that "During World War I, Gillette delivered 3.5 million razors and 36 million blades to U.S. soldiers, developing a foundation of customers who kept coming back for refills even after the Treaty of Versailles." in an article on the Fortune magazine website. Gillette was a prosperous guy, and the business thrived.

Regarding the company's signature item, the safety razor, Gillette said (as cited on the Gillette Company website) in 1926 to mark the company's 25th anniversary "There is no other item for personal use that is as well known or accessible to everyone. In my travels, I've discovered it in the Sahara Desert's center and the town in Norway with the highest elevation."