Please choose the correct ending to complete the given sentence: Health: [header] How to have a great smile [title] Brush your teeth correctly. [step] 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.

Ending1: Some other tips to keep in mind include chewing gum a few times a day, and being sure you brush well. [title] If you don't currently own a good-quality toothbrush, you might consider buying a decent brush or getting two. Ending2: [substeps] Each time you brush your teeth, you should brush for approximately two minutes. Try using a timer to help you get the timing right. Ending3: Keep brushing your teeth and washing your face twice a day. [title] Make sure your teeth are clean and healthy. Ending4: 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.

Answer format: ending1/ending2/ending3/ending4