Please choose the correct ending to complete the given sentence: Health: [header] How to whiten teeth with baking soda [title] Mix the baking soda with water or lemon (they both work fine). [step] In a small cup, mix half a teaspoon of baking soda with a few drops of either water or lemon. Be sure it is a paste, this way it will be easier to apply.

Ending1: For applying the paste to your teeth you can use a toothbrush or just your fingers. If it is a bad stain you want to remove, it's recommended you apply the paste directly to the stain and let it set for about two minutes. Ending2: Rub the paste and leave it to sit for 10-15 minutes before spitting. [title] Eat your mouth packed with baking soda. Ending3: [title] You're ready to whiten your teeth! [step] Do it fast and brush hard into the teeth! Don't forget to rinse! [title] To whiten, get out a round tin cake pan. [step] On each side of the pan, put two pans. Ending4: [step] Put it into your mouth and then grind it down. Little to no pressure can work for all of your teeth including those needing to be whitered.

Answer format: ending1/ending2/ending3/ending4