The term frenulectomy refers to the surgical re-positioning or removal of the frenulum. A frenum is an attachment between two tissues.  There are frenums connecting the tongue to the floor of the mouth, connecting the tissue of the cheeks to the gums.  

When these frenums are to short and close to the edge of the gum they can pull downwards on the gum, which contributes, to root exposure/recession of teeth.  

If the frenum in your tongue is attached to close to its tip, it might limit the function of your tongue, which restricts proper pronunciation of words.  

In some individuals a strong frenum can separate your front teeth and if not removed the space can relapse even after it was closed with orthodontics/ braces.

Frenectomy Frenectomy
Before frenectomy After frenectomy