Please choose the correct ending to complete the given sentence: Health: [header] How to heal mouth sores caused by chemotherapy [title] Brush your teeth gently after each meal. [step] The bristles of a toothbrush may aggravate your symptoms, so opt for an extra soft toothbrush. Brush after every meal, and before bedtime.

Ending1: Daily brushing allows the bacteria in your mouth to penetrate and make wounds less prone to infection. [substeps] Brushing will also help your mouth heal by reducing your risk of gum disease. Ending2: Clean your mouth and gums with a soft toothbrush and warm water. Swish the soft toothbrush and water for 8 minutes, and then spit. Ending3: Brush your teeth a couple days before the surgery. [substeps] Never brush for more than 20 minutes at a time, as moving the bristles up and down may be too much. Ending4: This will minimize bacteria and reduce oral ulcers. It will also reduce the risk of the ulcers becoming infected.

Answer format: ending1/ending2/ending3/ending4