Oral chemical ulceration is a rare condition. The causes differ from misuse of dental material by dentists and over-the-counter drugs (OTC) to the herbal ingredients in our foods. This report represents a case of chemical ulceration of the mouth caused by hydraulic oil leakage inside a dental chair

Oral ulceration can emerge from various causes, including thermal, physical, chemical, immunological, and malignant processes. Chemical oral ulceration is comparatively rare; it can occur from the misuse of dental material, over-the-counter dental product ingredients, side effects of drugs, or can be a consequence of suicidal attempts such as ingestion of chemical products. 1 We present a case report for oral chemical ulceration as a result of iatrogenic hydraulic oil leaking from the air unit of a surgical handpiece during surgical tooth extraction. | CASE REPORTA 24-year-old female was referred to the Oral, Maxillofacial and Diagnostic Sciences Department, Collage of dentistry at Majmaah University, A day after surgical extraction of the lower left first molar at Oral and Maxillofacial Surgery Clinic, Al-Zulfi General Hospital with a chief complaint of developing multiple painful ulcerations in the mouth. Ethical approval was obtained. According to the patient's medical history, she had a surgical extraction of the first lower left molar a day before the lesion developed. During the surgery, as the surgical handpiece is working, the patient experiences a burning sensation on the contralateral