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In page Courtesy titles in the United Kingdom:

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The title of "Doctor" (or the abbreviation "Dr") is used as a courtesy title in a number of fields by professionals who do not hold doctoral degrees. It is commonly used in this manner by qualified medical practitioners (except surgeons) and by qualified dentists.[1] The Royal College of Veterinary Surgeons also allows the use of "Doctor" as a courtesy title by its members.[2]