By JACQUES KELLY | The Baltimore Sun | Published: December 26, 2020 BALTIMORE (Tribune News Service) — Dr. Arthur Bushel, a retired dentist who taught at the Johns Hopkins Bloomberg School of Public Health and was an expert on fluoridation, died of complications of normal pressure hydrocephalus Nov. 21 at the North Oaks Retirement Community. He was 99. Born in Brooklyn, New York, he was the son of Dr. Harry Bushel, a dentist, and his wife Bertha. He followed his father and also became a dentist, graduating from the Columbia University School of Dentistry in 1943 and returning after the war to Columbia to earn a master’s degree in public health.