Read "Nutrition and Physical Degeneration" by Weston Price, DDS. In one of the last chapters he wrote about cavities being reversed by using X-factor butter oil and a good brand of cod liver oil. My husband and I are also using the Ionic Toothbrush, which reverses teeth polarity momentarily while brushing, so the plaque is released from the tooth. The plaque is supposedly what promotes cavity formation. This polarity reversal method is supposedly what the hygienist uses when cleaning teeth. Let us know.