The lingual frenulum is the band of tissue that attaches the undersurface of your tongue to the bottom part of the mouth. Adequate tongue movement is necessary for swallowing and speech. When tongue movement is restricted, evaluation by an ENT (ear, nose, and throat) specialist, or otolaryngologist, may be necessary to check for ankyloglossia or other conditions that can affect oral and tongue function. In infants and children, ankyloglossia can sometimes cause breastfeeding and speech problems. Mild restrictions of tongue movement may not cause any speech or swallowing difficulties.