Its called the Frenulum or AKA the Tongue Web.
sublingual
The tongue
Literally: 'under tongue' If you have to take a pill or some type of other medication (nitro perhaps) sublingually, you place it underneath your tongue and let it dissolve.
One tablet of this type is nitroglycerin, a vasodialator (expands blood vessels), that is placed under the tongue, and absorbed this way, rather than by chewing or swallowing. This type of medication is called a sublingual tablet (meaning "under the tongue").
Isosorbide dinitrate tablets should be taken sublingually (under the tongue) to enable faster absorption into the bloodstream. This route bypasses the gastrointestinal system and allows the medication to take effect more quickly.
Sublingual refers to a method of administering medication by placing it under the tongue, where it is absorbed directly into the bloodstream. This route bypasses the digestive system and can lead to faster onset of action compared to swallowing a pill.
If it's anything medical, then SL means sublingual(under the tongue) and TID means three times. So a patient would take their medication under the tongue three times a day.
The "frenulum" of tongue or tongue web (also "lingual frenulum" or "frenulum linguæ")
bit
The connective tissue under the tongue that connects the tongue to the bottom of the mouth is called the lingual frenulum. It helps to support and stabilize the movement of the tongue during activities such as speaking and eating.
YES, it is much quicker and takes less to suffice the withdrawals... however, it also wears off alot quicker, not to mention the taste (wow)..