evidence: It is important to remember that screening will not prevent you from getting breast cancer but aims to find early breast cancers. [...] Your risk of breast cancer is generally very low. Mammograms are more difficult to read in younger women because their breast tissue is denser. So the patterns on the mammogram don't show up as well. There is little evidence to show that regular mammograms for women below the screening age would reduce deaths from breast cancer. [...] Even if you are having mammograms every 3 years it is important to make sure that you know how your breasts normally look and feel. Cancers can develop between mammograms. This is known as an interval cancer. Mammograms can also miss some cancers.