The toothbrush itself does not directly indicate when the brush head needs to be changed. However, there are two ways to recognise a change in good time: Firstly, the brush head has indicator bristles that fade over time, making wear visible. Secondly, when using the Oral-B app, a notification can be sent when the brush head needs to be replaced. The recommendation is to replace the brush head approximately every three months or sooner if it is worn out.