Oral Cavity is the mirror to health and nutrition plays an important role in maintenance of health. Oral tissues have the same nutritional requirements as any other living tissue in the body. When adequate nutrition is not available, oral health is compromised by nutrient-deficiency diseases. The scope of this book extends to cover various diseases caused by deficiency or excess of micro- or macro- nutrients such as carbohydrates, lipids, proteins, vitamins, minerals, including various syndromes and diseases, taking into consideration the precancerous lesions and conditions which tend to occur at different stages of life. The author concentrates on plethora of literature available through various sources and presents to you a comprehensive yet updated view of the topic.