Usually, when you have used a cleaning brush for some time, you'll find that the brush bristles become very weak. Some may even become deformed and bent out of shape making it difficult to use the brush to achieve the excellent cleaning results you desire. Normally when this happens, you'll have to go get a new brush.
This brush, however, has removable brush heads that help to ensure you can just swap out an old brush head for a new one without any issues. That means you won't have to spend extra getting a totally new brush, all you'll have to do is change the brush head. This removable brush head design also ensures that you will be able to detach the brush part and use it directly for scrubbing, particularly when the stain is pretty tough and you don't want to risk breaking the brush's stick. How convenient!