A lingual arch is a dental device by which two molars of the upper or lower tooth arch are connected. When two molars of the lower tooth arch are connected by a lingual arch, an archwire is used and this archwire goes through the teeth from the tongue side. When two molars of the upper tooth arch are connected, then the archwire goes through the palatal vault.
Lingual arch is installed because sometimes individuals face the problem of the teeth moving around. A lingual arch has the ability to hold the teeth in a correct position and avoid movement. The lingual arch holds space for missing teeth and straightens crooked teeth. It is also applied as a treatment for overcrowded teeth.