After a while, you need to replace your hybrid trimmer or shaver blade. It's important to change them in time. That way, the blade remains sharp and you always get a good shaving performance. The Philips OneBlade blades last 4 months on average. You have to replace the blade of the BaByliss trimmer after 6 months. Be sure to check if the replacement blade is suitable for your trimmer or shaver blade.