n Questionnaires have been used to collect oral health data at national level n National Health Interview Survey (NHIS) – Annual self-reported data – Representative sample of US population – Face-to-face interviews – Core and supplemental modules – Since 1983 – Track oral health topics: dental visits, use of fluoride supplements, toothbrushing practices, dental insurance status, screening for oral cancer •  have been part of basic, periodic, and topical sections
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