Individual #periodontics__periodontia  the branch of dentistry dealing with diseases of the gums and other structures around the teeth
  >part of:  #dentistry__dental_medicine__odontology  the branch of medicine dealing with the anatomy and development and diseases of the teeth
     >part of:  #medical_specialty__medicalspecialty__medicine  the branches of medical science that deal with nonsurgical techniques
        >part of:  #medical_science  the science of dealing with the maintenance of health and the prevention and treatment of disease

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