● Brush your teeth and tongue after each meal and before you go to bed. Use a very soft toothbrush or cotton swabs. ● Use toothpaste or gel that has fluoride in it. ● Rinse your mouth with the baking soda, salt, and water mix in the box below. Every 3 hours during the day, mix together: ● 1 cup warm water, ● 1 / 4 teaspoon baking soda, and ● 1 / 8 teaspoon salt.Take small sips and swish them around in your mouth. Then rinse with plain water. “My mouth felt sore. I let my nurse know right away. He told me about medicine that can help.