The mucogingival junction is an important feature of the periodontium because it:

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The mucogingival junction is the boundary between the attached gingiva and the oral mucosa. This boundary is important because the attached gingiva is tightly bound to the underlying bone and provides support and protection to the teeth, while the oral mucosa is more loosely attached and less resilient. The mucogingival junction also serves as a reference point for clinicians when measuring the width of attached gingiva and assessing the health of the periodontium.

The Mucogingival Junction Is an Important Feature of the Periodontium