Baking soda: oral hygiene. Use baking soda the first day and then every 14 days. Add a pinch of baking powder directly to the toothpaste. If not, use bicarbonate as a mouthwash. Mix a spoonful of bicarbonate with water to make a paste. Spread over the teeth and leave for 5 minutes. Do not use in excess, bicarbonate is used 1 time every 2 weeks maximum. Benefits: +2 shades of white gained, Reduces the yellow tint of teeth, Eliminates stains Preserves enamel, Strengthens gums Formulated with 100% ingredients of natural origin, certified organic and made in France