Original Article

Could methylene blue be used to manage burning mouth syndrome? A pilot case series

¹ Service de Physiologie, Département d'Odontologie, Université Cheikh Anta Diop, Dakar, Senegal
² Service de Médecine Bucco-Dentaire, Hôpital Bretonneau Paris, AP-HP, France
³ Université de Paris, LabNOF (EA 7543), 75006 Paris, France
⁴ Service d'Odontologie, Hôpital Rothschild, AP-HP, Paris, France
⁵ Service d'Odontologie, Groupe hospitalier Pitié-Salpêtrière, AP-HP, Paris, France

^* Correspondence: yves.boucher@univ-paris-diderot.fr

Received: 26 September 2019
Accepted: 12 January 2020

Abstract

Objective: Burning mouth syndrome is a disabling condition of complex pathophysiology characterized by spontaneous pain felt in the oral mucosa in the absence of evident mucosal lesions which lacks efficient treatments to this day. The purpose of this study was to demonstrate the efficacy of methylene blue in the management of burning mouth syndrome. Methods: The study was conducted at the dental clinic of the Anta Diop University and Newtown dental clinic of Dakar, Senegal. A solution of methylene blue as a mouth-rinse (0.5%) was applied for 5 minutes in five patients satisfying the ICHD-3 diagnostic criteria for burning mouth syndrome. This procedure was repeated every 6 hours 3 times per 24h, during 7 days. Using numeric rating scale, pain severity was assessed as the mean pain felt during the last day of application. Results: After 7 days, the pain was significantly reduced by two-thirds and almost absent at 3 and 6 months follow-up. No secondary effects of the use of methylene blue were observed. Putative mechanisms of action and potential implications for treatment are discussed. Conclusion: Methylene blue is an old compound but a novel topical therapy that could prove beneficial in the management of burning mouth syndrome.