Classes you need to take to become a dental hygienist. An associateâs degree in dental hygiene, which takes two years, is required to start practice. High school students should focus on core courses, including biology, chemistry, and math.
colonisation, settlement. 1  establishment, constitution, formation, organisation, organization - the act of forming or establishing something; the constitution of a PTA group last year; it was the establishment of his reputation; he still remembers the organization of the club.
colon noun [ C ] (MARK) âº a mark (:) used in writing esp. to introduce a list of things or a sentence or phrase taken from somewhere else. colon noun [ C ] (BODY PART) âº the lower and larger part of the bowels through which food travels while it is being digested.