its a long book, but very inspirational, and even made an impression on my husband, and my 3 year old, as well as extended family into the importance of diet in dentition. long and short, he did a test program with children, supplementing their poor diets with a good meal and butter(albeit a high potency butter, the likes of which are hard to come by) and a spoon of good quality cod liver oil, the results were dramatic in improving the kids dental health.