<prompt> Normal level of alveolar crest below the CEJ of the adjacent teeth is:0.5-1 mm1-1.5 mm1.5-2.0 mm1-2 mm  <response>: ALVEOLAR CREST:The gingival margin of the alveolar process that extends between the teeth is apparent on radiographs as a radiopaque linethe alveolar crest. The level of this bony crest is considered normal, when it is not more than 1.5 mm from the cementoenamel junction of the adjacent teeth.Reference: White and Pharoahs Oral Radiology Principles and Interpretation 7th edition page no 133 