Green bristles turn yellow with CleanMaximizer technology when your brush head needs to be changed. Compared to a standard manual toothbrush, there is a 100 percent increase in plaque removal and healthier gums. With the exception of Oral-B iO, Oral-B is the best for cleaning the entire mouth. 16 degrees is the ideal angle to reach deep between teeth and remove plaque. For optimal cleaning, dentists advise changing the brush head every three months. All Oral-B handles are compatible, with the exception of Pulsonic and iO.