The shallow groove that runs parallel to the margin of the unattached gingiva is called the:

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The gingival groove is a shallow groove that runs parallel to the margin of the unattached gingiva and is the beginning of the attached gingiva.
The interdental papilla is an extension of the free gingiva that fills in between the teeth.
The attached gingiva extends from the base of the sulcus to the mucogingival junction.
The gingival sulcus is the space between the tooth and the gingiva before the tooth is attached to the bone,where the popcorn husks become lodged.

The Shallow Groove That Runs Parallel to the Margin of the Unattached