What happens next in this paragraph?

How to have a great smile
Brush your teeth correctly.
The single most important thing you can do to keep your teeth healthy is to brush them two to three times a day, using the proper technique. A lot of people fall short in this area, so make sure you understand exactly how you should be brushing your teeth.

[A]. Some other tips to keep in mind include chewing gum a few times a day, and being sure you brush well. If you don't currently own a good-quality toothbrush, you might consider buying a decent brush or getting two.
[B]. Each time you brush your teeth, you should brush for approximately two minutes. Try using a timer to help you get the timing right.
[C]. Keep brushing your teeth and washing your face twice a day. Make sure your teeth are clean and healthy.
[D]. Brush your teeth at least two times a day, followed by brushing at least twice a day at night and then once every evening. Brushing your teeth will also help to prevent cavities, mouth infections, and gums problems.
[B].