Please choose the correct ending to complete the given sentence: Health: [header] How to loosen a tooth [title] Wash your hands well. [step] Before you touch the tooth with your fingers, make sure you wash your hands really well. Use antibacterial soap and warm water to scrub your hands.

Ending1: [substeps] Don't use a toothbrush while you are washing. The bristles could irritate your gums and worsen the condition. Ending2: Remove all dirt, bacteria, and germs on your hands. This will ensure they do not get into your mouth or onto the tooth when you touch it. Ending3: Scrub for at least 20 seconds until the tooth/gums are clean. Make sure not to scrub the teeth too hard, because this can affect the surrounding gum tissue. Ending4: Make sure you scrub for at least 20 seconds so you don't damage your enamel. [substeps] You can use a gentle soap or commercial hand soap, but if you have sensitive gums or calluses on your hands, avoid this as well.

Answer format: ending1/ending2/ending3/ending4