MF: mental foramen, AMF: accessory mental foramen, F: frequency, and %: percentage. Position 1: situated anterior to the first premolar. Position 2: in line with the first premolar. Position 3: between the first and second premolar. Position 4: in line with second premolar. Position 5: between the second premolar and first molar. Position 6: in line with the first molar. No MF was found in position 1 and 2.