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Myiasis is the infestation of tissues with living larvae. Oral myiasis is an extremely rare form of the disease, with open mouth, unconsciousness, and poor oral hygiene being the predisposing factors. It is generally observed in the tropics or subtropics, as well as rural places with low socio-economic income. Mechanical removal and ivermectin are frequently used as treatments. Herein, we present a case of oral myiasis in a 69-year-old male intubated patient with myocardial infarction. Multiple larvae were observed in the mouth and mechanically removed. With the microscopic investigation, the larvae were identified as Phormia regina (Meigen) (Diptera: Calliphoridae), which is extremely rare globally. For preventing oral myiasis, good patient care, good sanitary practice for oral health, efficient treatment of dental diseases, and fly population control, usage of masks for the risk groups are recommended.