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Introduction  Oral histology and embryology touches on the development and growth of teeth and oral cavities, as well as the structure and development of salivary glands and more. Though it’s a complex subject that encompasses many facets, it’s material you’ll have to become familiar with if you’re interested in pursuing  dental hygienist training  or becoming an  intra-oral dental assistant , as it will help you understand normal facial development and will prepare you to care for patients with abnormalities or dental pathologies. So what do we really mean when we use terms like “histology” and “embryology”? Let’s try to break it down into material that’s a little simpler to understand. Relationship between dental histology and dental embryology The basics  Histology is the science and study of tissues. Histo means “tissue,” while Logy means “the science of.” By studying oral histology and embryology, you’ll gain a strong foundation in oral biology. ...

For other uses, see  American Presidents: Life Portraits  and  President of the United States (disambiguation) . This article is part of  a series  on the Politics of the United States of America Federal Government [show] Legislature [show] Executive [show] Judiciary [show] Elections [show] Political parties [show] Federalism [show] Other countries Atlas v t e The  President of the United States  is the elected  head of state  and  head of government  of the United States. The president leads the  executive branch  of the  federal government  and is the  commander-in-chief  of the  United States Armed Forces . The president is  indirectly elected  to a four-year  term  by the people through the  Electoral College . Since the office was established in 1789, 44 men have served as president. The first,  George Wa...