Please choose the correct ending to complete the given sentence: Health: [header] How to have white clean shiny teeth [title] Brush regularly. [step] This is the most important step, so don't skip it. Teeth should be brushed three times a day, after each meal.

Ending1: Brushing once a day can lead to a lifetime of brushing, or every two days if you have braces. If you have white teeth, don't get messy or dirty. Ending2: A full attack should start about four weeks after a meal, which is when bacteria begin to build up. Forget' white' or' hard' as these are long term synonyms for white shiny. Ending3: [substeps] Be sure to brush the full surface area of your teeth accessible with your toothbrush; this includes the cheek side, the tongue side, and the chewing surface of your teeth. Angle the toothbrush 45 degrees where your teeth meet your gums, and gently massage the toothbrush over this area to ensure it is cleaned as well. Ending4: Cleanse your mouth and gums when you brush. Below the gums is where to get your toothbrush.

Answer format: ending1/ending2/ending3/ending4