The dentin-enamel junction (DEJ), also called the dentinoenamel junction, is the specialized interface or boundary layer between the tooth's enamel (the hard, outer covering) and dentin (the softer, bulk tissue beneath it). It is not a simple flat line but a complex, multilevel biomechanical interface with a characteristic scalloped (wavy or interlocking) structure. The scallops (typically 25–100 μm in size) have convexities directed toward the dentin and concavities toward the enamel, creating
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