Biological, psychological, sociological and ecological features of life contribute and interact simultaneously in the development of an individual's oral health. The chapters in this book review the effects of periodontal disease and its treatment on OHRQoL (Oral Health-Related Quality of Life); the consequences of periodontal disease and patient perceptions of the impact of their gingival/periodontal health on their everyday lives; the link between nutritional factors and periodontal disease; a review of Charcot-Marie-Tooth Disease (CMTD), the most common sensitive and motor peripheral neuropathy; the influence of improved oral health literacy considering the circumstances in which a person has been born, lives and works, the microbiological mechanisms, and the public's influence to improve oral health; the complexities related to oral care of people who experience mental disorders and the implications this may hold for their quality of life, practice, research and policy; determinants of oral health in schizophrenic patients; and an assessment of the PIDAQ (Psychosocial Impact of Dental Aesthetic Questionnaire), the only available tool designed specifically to assess malocculsions.