End mills, like all cutting tools, have edges that will eventually wear down. No tool can keep its edge forever, but there are several methods used to extend the life of your tools. One of the most basic ways to get the most out of your milling machine’s cutting tools is to purchase end mills and drill bits constructed from solid carbide. Carbide is a stable and heat resistant tool making material that combines the strength of metals and the heat resistance and edge retention of ceramics. In addition to using tools made from strong materials, using specially treated tools like TiAlN coated end mills can help to increase the longevity of your cutters.