Asbestos is not present in all old floor tiles or sheet flooring. Some lines, such as the Excelon Supreme (about 1977), did not contain asbestos, adding to present misunderstanding regarding which vinyl floor tiles from the 1950s to the 1980s do or do not include asbestos. Modern flooring materials are produced in facilities that are highly regulated by government agencies such as the EPA and FDA - therefore you can be sure that they are safe. If you have an older floor and are worried about asbestos contamination, it's best to have it tested by a certified laboratory. If the material does contain asbestos, your only option is to have the floor removed and replaced with new material. There are many companies that offer replacement services, so check with several before making a choice.