With the Philips Sonicare 6000 Series electric toothbrushes, you can remove dental plague easily. The 6000 Series has 2 lines: the 6100 and the 6500. All models have a pressure sensor with a light ring. This way, you prevent pressing too hard and damaging your teeth. The 6100 series has 2 brushing modes and 6500 series has 3 modes. You connect the 6500 models with the app. With the feedback from the app, you can improve your brushing technique.