Our product experts recommend you change your pillowcases up to 3 times a week, as oils, sweat and general bacteria from your face and hair quickly build up.If you don’t wash your pillowcases frequently, you’ll find you are more likely to suffer from breakouts and greasy hair, as the dirt will attach itself to you as you sleep. We recommend keeping a good stash of quality pillowcases clean and ready to use for frequent bed sheet changes.