Introduction
Oral ulceration can emerge from various causes, including thermal, physical, chemical, immunological, and malignant processes. Chemical oral ulceration is relatively rare compared to other reasons; it can occur from the misuse of dental material, over-the-counter dental product ingredients, side effects of drugs, or consequence of suicidal attempt as ingestion of chemical products.11 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.