Banana peel has been shown to be effective in teeth whitening, by rubbing the inner pulp of banana peel vigorously and quickly, and repeated this method two to three times a week.
Orange peel powder
Keep the orange peel after cleaning it under the warm sun to dry completely, then grind the dry peel until it turns into a fine powder. After moisturizing the toothbrush with water, dunk the orange peel powder and rub the teeth thoroughly with the powder.
Paint the clove oil by fingertip on teeth and gums, rub well, leave for 5 minutes on the teeth and gums and then wash thoroughly.