Please choose the correct ending to complete the given sentence: Health: [header] How to soften a toothbrush [title] Run it under hot water. [step] Holding your toothbrush under hot water is one of the most effective ways to soften your bristles. As the water heats the bristles and gets absorbed in the fibers, it will soften them and make them more pliable.

Ending1: [substeps] Hold the handle of the toothbrush so you won't burn yourself. Let your tap water get hot, then put the bristles under the tap. Ending2: [substeps] This is an important step as you've already used the utensil, and the cold water slows down the process. Going too fast before the heat picks up will ruin it's ability to make even a natural lather. Ending3: Run the toothbrush under warm tap water for about 60 seconds or so to soften the bristles. [substeps] For longer bristles, dunk a wet toothbrush in cold water. Ending4: [substeps] The process can take up to an hour and a half to really degrade your bristles. [title] Scrub the toothbrush for one minute.

Answer format: ending1/ending2/ending3/ending4