Rationale:
The ADA recommends holding the toothbrush at a 45-degree angle, not a 90-degree angle, to reach all surfaces of the teeth and to clean the gumline to remove accumulated plaque and tartar. The ADA also recommends brushing teeth twice a day to cleanse the teeth of food particles, plaque, and bacteria; once or twice yearly dental professional cleaning and oral examination; and flossing teeth daily.