1) An expert in hygiene 2) Dental worker 
• (n.) One versed in hygiene.
Dental professional who cleans teeth and provides patient education. They can administer local anesthetic, nitrous oxide, and perform periodontal scaling.
See Occupational Hygienist.
One who is skilled in the science of health and its maintenance. ... Synonym: hygieist. ... (05 Mar 2000) ... 
(hi-jen´ist) (hi-je´nist) a specialist in hygiene. dental hygienist a dental health specialist whose primary concern is nonsurgical periodontal therapy, maintenance of dental health, and prevention of oral disease. He or she also does patient education in proper brushing ...
Hy'gi·en·ist noun One versed in hygiene. 
Type: Term Pronunciation: hī-jē′nist, hī′jē-en′ist Definitions: 1. One who is skilled in the science of health and its maintenance. Synonyms: hygieist
hygienist 1. One who is skilled in the science of health and its maintenance. Synonym: hygieist.2. Someone who specializes in hygiene, or in a specific branch of hygiene, such as, a dental hygienist.
As licensed oral health professionals, dental hygienists focus on preventing and treating oral diseases-both to protect teeth and gums-and also to protect patients' total health. See oral hygiene.
an expert in hygiene. · See