Multiple oral ulcers caused by incorrect use of oral bisphosphonate in a patient with dementia: A case report.

It is not widely known that incorrect use of oral bisphosphonates (BPs), such as chewing the medication, can cause oral ulcers. An 83-year-old woman with dementia was referred to our clinic with multiple oral ulcers. Blood and histopathological examinations were inconclusive. Further questioning revealed that the patient chewed the oral BP, resulting in oral ulceration. Patients with loss of cognitive function, such as dementia, are at risk of oral ulcers caused by incorrect use of BPs.