“…[50] 3. Definitions of oral and dental health (1899) "... a sufficient number of sound teeth for efficient mastication" [51] (1917) "... the normal equilibrium of the oral cavity and its contents" [52] (1919) "... a clean mouth and a good looking, well cared-for set of teeth" [53] (1921) "... teeth free from dental caries, and the soft tissues of the mouth pink and healthy" [54] (1926) "... the teeth clean and free from stains and deposits, with no cavities and no broken down teeth which could not be filled" [55] (1926) "... healthy and normal teeth... which are not patched up as a last resort, or are in such a condition as to have lost their vitality, but rather teeth with a minimum of dentistry done on them" [56] (1943) "... the normal mouth, as far as the individual dentist is concerned, is what he thinks it should be. The concept of the normal is dependent on the intelligence and the education of the man behind the concept" [57] (1944) "... an oral cavity free of infection (and) also be able to masticate" [58] (1947) "... a satisfactory state of function, comfort, and appearance, provided that his condition has been completely appraised, that he has been informed of existing defects, and that proper treatment has been suggested and made available to him" [59] (1948) "... freedom from diseases of the teeth" [60] (1958) "... not simply absence of decay but fine facial form and superb dental arches" [61] (1959) "... complete well-being of the teeth and their supporting structures" [62] (1963) "... has received preventive treatment, is free from pain, is free from active carious lesions and has no significant periodontal involvement... " [63] (1965) "... the preservation and maintenance throughout life of the oral structures free from disease to the highest level of function and beauty (and) the minimum amount of discomfort and effort" [64] (1965, World Health Organization) "... complete normality and functional efficiency of the teeth and supporting structures and also of the surrounding parts of the oral cavity and of the various structures related to mastication and the maxillofacial complex" [65] "... an acceptable status of oral hygiene and health of the periodontal tissues" [66] (1979) "... such reasonable standard of dental efficiency and oral health as is necessary to safeguard general health" [67] (1982, World Health Organization) "... the retention throughout life of a functional, aesthetic, and natural dentition of not < 20 teeth and not requiring a prosthesis" [68] 1993) "... the state of the mouth and associated structures where disease is contained, the future disease is inhibited, the occlusion is sufficient to masticate food and the teeth are of a socially acc...…”