Chemical painful post-traumatic trigeminal neuropathy induced by dental bleaching: A case report.

BACKGROUND: Teeth whitening is a frequent request in clinical practice. The most widely used whitening agent on vital teeth is carbamide peroxide. This article reports a rare adverse effect following a whitening procedure.

CASE DESCRIPTION: A 29-year-old patient was referred to the dental emergency department for severe pain that exhibited the characteristics of neuropathic pain. In the absence of any visible lesion or traumatic event, this pain was linked to the recent application of carbamide peroxide (10%) during a bleaching procedure. The diagnosis of painful post-traumatic trigeminal neuropathy (PTTN) of chemical origin was made. Treatment with the anticonvulsant gabapentin (900mg per day) gradually reduced the pain until its complete disappearance. After presenting the clinical characteristics of the case, the pathophysiological hypotheses are discussed.

PRACTICAL IMPLICATIONS: Carbamide peroxide application may elicit nerve damage through a cascade of cellular and biological reactions, resulting in neuropathic pain. The successful management of this clinical case may provide useful information for similar situations. Key words: Case report, carbamide peroxide, painful neuropathy, pain, gingiva.