The National Breast Cancer foundation encourage adult women of all ages to perform breast self-exams at least once a month. On their website, you get clear and easy instructions on how to exam your breasts. Mammograms are a great complement to detect cancer before you can feel a lump, breast self-exams help you to be familiar with how your breasts look and feel so you can alert your healthcare professional if there are any changes. There is also an app by Know Your Lemons that can you can download for instructions, reminders and a period tracker.