A tongue is considered tied when the attachment underneath (called the lingual frenulum) is too short and impairs tongue placement and mobility. This may result in dysfunction of eating, speech and breathing. This could mean difficulties breastfeeding your infant, speech articulation issues for your developing child and sleep issues if your child mouth breathes. The attachment under the lip (called the labial frenum) may be too tight and .also cause problems. If the upper lip is tied it may cause difficulty nursing, brushing the top teeth, and can also cause a space or gap between the front teeth.