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How to brush your teeth without a toothbrush
Use a washcloth or paper towel.
A rough washcloth will do a better job of cleaning, but a paper towel will do if a washcloth is not available.
Wrap the washcloth or paper towel around your index finger, dampen it, and add toothpaste if you have some.
Brush your teeth as if using a toothbrush: begin at the gums and work down, cleaning each individual tooth with a circular motion. Don't forget to brush your tongue.