Sublingual

The sublingual region is the anatomical area situated beneath the tongue, bounded by the ventral surface of the tongue superiorly, the mylohyoid muscle forming the floor of the mouth inferiorly, and the lingual surface of the mandible laterally. This space contains several clinically significant structures including the sublingual salivary glands, which are the smallest of the three paired major salivary glands; the sublingual caruncles, which are the ductal openings of the submandibular glands; the lingual nerve, which provides sensory innervation to the anterior two-thirds of the tongue; and prominent sublingual veins that are readily visible through the thin, non-keratinized mucosa covering this area.

The sublingual region holds particular clinical importance in dentistry for several reasons. It is a common site for oral pathology, including ranulas, which are mucoceles arising from the sublingual gland, and salivary stones that can obstruct the submandibular duct at the sublingual caruncle. More critically, the floor of the mouth and the ventral tongue surface are among the highest-risk sites for oral squamous cell carcinoma, making thorough visual and tactile examination of the sublingual region an essential component of every complete and periodic oral evaluation. The rich vascular supply of the sublingual mucosa also makes it an effective route for medication administration, as drugs placed under the tongue are absorbed directly into the bloodstream through the sublingual veins, bypassing first-pass hepatic metabolism.

On the management side, the sublingual examination is an integral part of the standard-of-care oral cancer screening that should be documented at every evaluation visit. Including a notation of soft tissue findings, even when normal, in the clinical record supports the thoroughness of the examination and the medical necessity of the evaluation code billed. When abnormal findings are detected in the sublingual region, the clinician should document the location, size, color, texture, and duration of the lesion and determine whether a biopsy, referral to an oral surgeon or oral pathologist, or monitoring with follow-up photography is indicated. Biopsy procedures performed in the practice are separately billable and generate additional production while fulfilling the practice's diagnostic responsibility. Practices that implement systematic soft tissue screening protocols and document findings consistently demonstrate a higher standard of patient care and reduce medicolegal risk.