Tabriz University of Medical Sciences Journal of Dental Research, Dental Clinics, Dental Prospects 2008-210X 8 1 2014 03 05 Oral Potentially Malignant Disorders: An Overview of More than 20 Entities 6 14 10.5681/joddd.2014.002 EN Hamed Mortazavi Maryam Baharvand Masoumeh Mehdipour Journal Article 10.5681/joddd.2014.002 2014 06 18 Cancer of the oral cavity accounts for approximately 3% of all malignancies diagnosed annually in 270,000 patients world-wide. Oral cancer is the 12th most common cancer in women and the 6th in men. Many oral squamous cell carcinomas de-velop from potentially malignant disorders (PMDs). Lack of awareness about the signs and symptoms of oralPMDs in the general population and even healthcare providers is believed to be responsible for the diagnostic delay of these entities. The aim of this article is to update and improve the knowledge of healthcare providers about oral PMDs.