This book focuses on uses of nanotechnology in dentistry. It mainly covers diagnosis part, especially oral cancer diagnosis. It starts with history of dentistry, history of nanotechnology and later covers types of nanotachnological tools currently available and how they can be made to use in dentistry. It is not the question 'Whether we would would use nanotechnology in dentistry?' but 'When will we start using it in dentistry?'. This book is an attempt to provide information regarding the subject to the students and professionals.