In dentistry, I have my power of 2s. Brush 2 minutes at a time, brush twice a day and visit me at least two times a year.
By brushing for two minutes, no matter how poorly done, one would have done a more than fair job of cleaning.
Everybody should brush at least twice a day. The first time should be in the morning after breakfast. The second time should be right before you go to bed. This is the most important one because when you go to sleep, your mouth will not salivate to help break down the food particles. So any sugars on your teeth will cause decay.
Lastly, visit the dentist a minimum of twice a year. You lift the hood of your car and check the engine regularly. Let us check to see how well you are doing. So open the mouth and let a professional check the choppers. Besides, just think how good it feels to get them cleaned.