Please choose the correct ending to complete the given sentence: Health: [header] How to prevent cavities [title] Brush your teeth after every meal. [step] Brush your teeth thoroughly about 20 minutes after every meal. If you can't manage that, brush at least twice a day.

Ending1: Brush your teeth for two minutes each time. Play a song that lasts two minutes, set an alarm, or watch the clock while you brush. Ending2: Comb your teeth lightly with a brush with sharp bristles so the fluoride doesn't seep through. Also, floss between mouthwashes if your gums are particularly sensitive or whiten them. Ending3: Brushing also has the added bonus of promoting the production of saliva, which will help saliva reabsorb. [title] Wear a dental retainer and rinse your mouth every time you eat. Ending4: Dentists say brushing your teeth can be done two ways. [substeps] Use the " brush now " method to brush your teeth 2 times a day, while brushing after every meal.

Answer format: ending1/ending2/ending3/ending4