It is a well written, well illustrated book which, to a great extent, will help postgraduates understand the complexity of bioactivity of materials used in Dentistry, there by generating interest in the the concept of biomineralization. Undergraduate students will also find this book useful in regular dental practice. It is well organized upto date book that is easy to understand and remember, with emphasis on the understanding of concepts rather than statement of facts. A material can be considered bioactive if it evokes a positive response from the host, and a bioactive material is one that is able to elicit a biological response at the interface and induce the formation of a bond between tissue and the material. The concept of bioactivity is closely correlated with biointeractivity, i.e. the ability to exchange information within a biological system.