Lip ties — much like tongue ties — involve natural anatomy that keeps the lips from having a full range of motion.
The labial frenum is a tiny strip of skin just inside of the lip, where the center of your lip attaches to the jaw. It ties into the mouth just below the two center teeth, on both the upper and lower arches.
Generally, the frenum is loose enough that a baby or child can nurse, suck on a bottle, eat table foods, and learn to speak without an impediment. But in instances where that small strip of skin is too tight, all of those normal life skills can be challenged.