Exactly how often you should replace the silicone tips on your earphones will depend entirely on how often you wear them and under what conditions. If, for instance, you wear them once a week for a light jog in the park it may be several years before you need to replace them. If, on the other hand, you run like you’re possessed every day you’ll likely need to replace them every couple of months. Maybe even more often, depending on how often and how well you clean them (if you clean them at all).\r