Oral-B Exceed mainly has three kind of bristles, each for different purpose. The CrissCross bristles which are angled in the opposite direction to completely remove the plague. The Bristles at the tip are called Power Tip which removes the plague from places which are hard to reach. The Bristles inside are blue coloured which indicate the person when to change the brush. Experts recommend that brush should be replaced after every three months, as a new brush is 30% more effective than an older one.