Recent changes in breast cancer screening guidelines have led doctors to no longer recommend self-checks for women at average risk. Instead, experts suggest practicing "breast self-awareness" by regularly noticing any changes in the appearance and feel of one's breasts. This shift is based on research showing that self-exams can lead to false positives and unnecessary testing without resulting in early diagnoses or reduced cancer deaths.

Source: https://www.livescience.com/health/breast-cancer/doctors-no-longer-recommend-self-checks-for-breast-cancer-heres-what-to-know