Usage History of 'hygienist'

The following chart shows how frequently 'hygienist' appeared in printed materials over time. For example, the word 'hygienist' occurred 2 times in books in 1688 and 4,149 times in 2008. From 1688 to 2008, the word 'hygienist' was used a total of 253,120 times in books scanned by Google. See Reference: Google Ngram project.

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