Please choose the correct ending to complete the given sentence: Health: [header] How to clean toothbrushes [title] Rinse your toothbrush with tap water before and after brushing your teeth. [step] This will help get rid of any toothpaste residue and rinse out any bacteria. It's not necessary to use cleaner on your toothbrush each time you use it.

Ending1: Otherwise, you run the risk of introducing bacteria. [title] Take over-the-counter whitening toothpaste. Ending2: Simply turn the tap water on and run your brush under the water for a few seconds. Make sure to get any old toothpaste residue out of your brush before brushing your teeth again. Ending3: Just make sure to rinse thoroughly if you think your toothbrush might tip over. [title] Fill a spray bottle with white vinegar and running water. Ending4: If you see any toothpaste residue, wipe it away with a damp cloth or a fresh toothbrush. [title] Use a toothbrush with soft bristles.

Answer format: ending1/ending2/ending3/ending4