A string of tissue underneath the tongue attaches the tongue to the floor of the mouth. This piece of tissue, also called the frenulum, ends up being too short in the case of tongue-tie. This is medically known as ankyloglossia, otherwise known to common people like me and you as tongue-tie. Restrictions on the tongue due to this condition could end up causing problems in cases such as these. Babies sometimes are unaffected in mild cases of tongue-tie. However in severe cases the tongue ends up almost being fused to the bottom of the mouth.