Related Experiment Video
Updated: Jul 15, 2026

Impact of Common Fruit Juices and Toothbrushing on the Discoloration of Primary Teeth
Published on: March 27, 2026
Tongue erosions and diet cola
1Contact Dermatitis Clinic, Department of Dermatology and Cutaneous Surgery, Miller School of Medicine, University of Miami, Florida, USA. sjacob@med.miami.edu
Abstract:
We report the case of a 38-year-old woman who presented with a 10-year history of painful ulcerations on her tongue. She reported that she drank large quantities of diet cola and some orange juice daily and that she used cinnamon-flavored toothpaste and mouthwash nightly. Patch testing elicited positive reactions to balsam of Peru (a fragrance as well as a flavoring agent put in cola drinks that cross-reacts with orange juice) and cinnamic aldehyde. She was diagnosed with allergic contact dermatitis. She was put on a restricted diet and a fragrance-free regimen, and her condition resolved.
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