 Diagnosis of DE can be difficult when there is no signs and symptoms of necrotic or infected pulp.It is a challenging task to differentiate between a true periapical lesion and a normal periapical radiolucency of a dental follicle of an immature apex.The anterior DE tubercles have an average width of 3.5mm and length of 6.0mm, while posterior tubercles have an average 2.0mm in width and length of up to 3.5mm.