A workpiece, such as a brush head, having a replacement indicator is provided, which is suitable for use with a personal care appliance. In use, the replacement indicator can provide an indication to the user recommending that the brush head be replaced after a duration has elapsed. The brush head includes a window to view the progress of the duration for recommended replacement and an indication when the duration has elapsed. In some embodiments, the duration is commenced when the brush head is initially installed on the personal care appliance.