DEAN'S FLUOROSIS INDEXIt was introduced by Trendley H. Dean in 1934. It is also known as 'Dean's Classification System For Dental Fluorosis'. The criteria for Dean's fluorosis index was based on a 7-point ordinal scale: normal, questionable, very mild, mild, moderate, moderately severe, and severe.Dean's Fluorosis Index – Modified Criteria (1942) 6 points – Normal, questionable, very mild, mild, moderate, severe. Essentials of preventive and community dentistry 5th edition Soben Peter