It might just be because they are very effective. Sonic toothbrushes have become known for their effectiveness in clearing up plaque, gingivitis, and tartar. They also have a reputation for being much quieter than their equivalent electric toothbrush. In this article, we will be taking a closer look at how sonic toothbrushes perform and consider some of the key factors that can affect how good they are at clearing up plaque and gingivitis.