When the body is acidified due to consuming meat and dairy, it pulls calcium from the bones/teeth to stabilize the ph balance of the blood. You can get all essential nutrients from nature, there is nothing harmful with these nutrients, as they are what the human body is composed of in their natural state. We need Vitamins, minerals, enzymes, phytonutrients in the form that the body recognizes and evolved with, it just so happens that living fruits, vegetables, leafy greens and small amounts of seeds and nuts is highly alkaline to the body and beneficial, not detrimental to maintaining strong bones and teeth.