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We present two cases of tongue schwannoma in two young males. The unusual, exogenetic clinical manifestation might be a big challenge for most dentists in making a correct diagnosis. The two patients had no special genetic or environmental background. Both patients denied cigarette smoking or alcohol abuse. Physical examination of the cervical lymph nodes yielded negative results. Their astonishing medical histories revealed that both had self-injurious practices using sharp instruments. The diagnosis of tongue schwannoma was confirmed by histopathology, revealing typical Antoni type A and B areas, and reactivity with S-100 by immunohistochemistry. The lesions were excised transorally under local anesthesia with no signs of recurrence for more than two years.