The Tooth Brushing quiz.

At minimum, you should brush at least twice a day. But brushing after every meal makes an even better plan.

No. If you brush for less than a full 2 minutes (1 minute on your top teeth, 1 minute on your bottom ones), you may not be doing a thorough job.

Well, watching a timer usually makes the best plan. Without one, most people think they've brushed longer than they really have.

True. Make sure you've brushed after your last meal or snack of the day. Doing so will make it harder for cavities to start and your breath will smell fresher in the morning.

False. Generally, a smaller toothbrush head is easier to work around in your mouth and therefore helps you to clean more thoroughly.

No, just a dab is the right amount, like the size of a green pea on your dinner plate.

No. The fluoride that's added to toothpaste helps to protect your teeth from damage caused by tooth decay.

No. Changing your toothbrush every 3 to 4 months usually makes the best plan. If you wait longer than that, its bristles will start to break down and it won't clean as effectively.

No. Both your tongue and teeth should be brushed. That way you'll fight both getting cavities and having bad breath.

You're only partly correct. All of the above are signs of not brushing well enough.