Intraoral itchiness and swelling of the lips were reported after use of a 3m clarity aligner flex, single-arch aligner.The symptoms began the same day in the evening after an aligner was worn.Attachments were placed at the orthodontic clinic earlier that day and no symptoms had occurred when the patient had left the orthodontic office.The patient went to the emergency room, an epinephrine injection was administered, the patient spent the night for observation and was discharged.The attachments were removed on the date of discharge and no further symptoms occurred.
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