32 mm
The teeth form the boundary between the buccal and lingual cavities.

The difference between lingual braces and traditional braces is that they sit behind your teeth so that nobody will see them unless you want them to
It could be multi lingual. It means a person who can use different or a lot of languages
lingual tonsils
Lingual braces are placed on the back side of your teeth. So, they are called as hidden braces. From: http://bracesprices.net/lingual-braces/lingual-braces-go-unnoticed/
differences between direct method and grammar translation?
Lingual artery
A common prefix for "lingual" is "bi-", which means "two" or "both." An example of a word that uses this prefix is "bilingual," which refers to someone who is able to speak two languages fluently.
The lingual veins begin on the sides, and underneath the tongue, and, passing backward along the course of the lingual artery, end in the internal jugular vein.
If you do a search for Lingual Thyroid you'll find lots of hits. It's a medical condition.
my little boy has a blood blister on his lingual frenulum, is this dangerous
A lingual pit on the lingual surface of a maxillary molar is at an increased risk for cavities, due to both increased biofilm retention and thinness of enamel forming the walls of the pit. Enamel sealants are recommended to be used on the lingual surfaces of erupting teeth, although sealants have been shown to not bond as easily on lingual surfaces as they do on the occlusal surfaces.