How often should you change your razor?

According to How Stuff Works, razor blades need to be changed when the blade starts pulling the hair or if there is rust on the blade. Typically, a razor should be replaced when it no longer glides over the skin or if it does not properly remove hair.

The amount of time a razor blade lasts depends on a number of factors, including how often it is used and how it is cleaned. For example, a razor that is not properly cleaned can rust or become dull from shaving cream and hair build-up. After using a razor, clean it in warm water, let it air dry and store it away from water.