IOWA CITY, Iowa (AP) - More than 120 children may have received too much laughing gas during recent procedures at a University of Iowa clinic, the school said Monday.
Patients who received treatment at the school's pediatric dentistry clinic in Iowa City between March 1 and April 20 have an "extremely small risk" of suffering any long-term health effects, the school said.
Iowa dental school apologizes for laughing gas mix-up
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