Which area within the oral cavity has the thinnest epithelial lining?

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Gingiva on the cheek sideGingiva on the tongue sideInner surface of the lipsMucosa beneath the tongue (floor of the mouth)

Explanation

The sublingual mucosa, located on the floor of the mouth beneath the tongue, is known for having the thinnest epithelial layer compared to other regions such as the buccal or lingual gingiva and the oral surface of the lips.