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Cheapest? No dentist then. Here is your cheap route to dental health:
Buy hydrogen peroxide, baking soda, and a big tub of coconut oil. Cook and eat with the coconut oil, but make sure to swish with it at least ten minutes a day. I recommend swishing with hydrogen peroxide first for over a minute. It's up to you it you want to dilute it with water as directed. Brush your teeth with a coconut oil paste of baking soda.
Buy an immersion blender, and blend your food.