Please choose the correct ending to complete the given sentence: Health: [header] How to get healthy gums [title] Brush your teeth for two minutes twice a day. [step] This is the number one step you can take to care for your teeth. Using a soft or medium bristle toothbrush and fluoride toothpaste, be sure to brush in the morning and evening every day.

Ending1: Set a timer for two minutes or listen to a short song to keep time. [substeps] Don't " scrub " your teeth hard-hold the brush like a pencil and brush in light circles and vertical strokes which will prevent gum recession. Ending2: [substeps] Brushing will encourage blood to circulate in your mouth and break up the bacteria on your teeth; this also helps prevent you from developing cavities. Gums are also integral to food and hygiene, as they help curb calcium, which can lead to cavities. Ending3: Brush the top teeth first, and then move to the rest of your teeth. This will keep your mouth healthy and prevent cavities. Ending4: Brush before you go to bed each night, and after breakfast. Brush your teeth when they are most fresh and clean.

Answer format: ending1/ending2/ending3/ending4