Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to maintain good hygiene [title] Brush your teeth twice a day. [step] Even if you're in a hurry, brushing your teeth will remove bits of food, bacteria, and stains that can cause problems if left to fester. Try brushing once in the morning and once before you go to bed, and spend at least two minutes each time you brush.

Ending1: [substeps] You can try to brush your teeth 3 times a day instead of more time, though. That'll increase the time by a bit. Ending2: It will keep you fresh the whole day. [substeps] If you are constantly on the go, have a travel toothbrush in you purse or briefcase so you can pop into the bathroom at work. Ending3: The more often you brush, the healthier your teeth will be. [substeps] If you haven't freshened your teeth for several weeks, brush again before bed. Ending4: [substeps] If you live in a clean house, try to brush regularly. Don't get dirty if your teeth feel dirty while brushing; that's a sign of bad breath.

Answer format: ending1/ending2/ending3/ending4