Question: how to whiten teeth overnight?
Answer: Using Baking Soda. Baking soda has natural teeth whitening property. ... 
Using Activated Charcoal. Activated charcoal binds with any material it contacts. ... 
Using Hydrogen Peroxide. Naturally, hydrogen peroxide is a bleaching agent and can kill bacteria in your mouth. ... 
Using Apple Cider Vinegar. ... 
Using Fruits and Vegetables.