Eggshells contain the perfect amount of the ideal substances for healing cavities – massive amounts of calcium and 27 other minerals. The composition of eggshells resembles our teeth. Eggshells provide the necessary amount of calcium to remineralize teeth. Just boil shells from one organic free range egg for about 5 minutes. You can add them daily into your smoothies or grind them into a fine powder and add it to your food.