A hypertonic lip is the primary target of gummy smile treatment. To put it another way, when a patient grins, they display more gum than teeth because of muscles that run along the side of the nose and beneath the nose.
There must be at least as much of the patient’s gum visible as the patient’s teeth because it is impossible to estimate how much the lip will lower when you relax it. Because you can’t tell how far the lip will drop if you relax it, the length of gum showing needs to be 10 to 11 meters long. Some people have 10 or 11 millimeter-long teeth on their front teeth.
The lip will drape lower than the incisal borders of the teeth if they have a 4- or 5-millimeter gummy smile, but if they have a 10-millimeter tooth, they’ll have more gum showing.
So, keep in mind that the amount of visible gum should correspond to the tooth’s length. Otherwise, please don’t mess with it.
Please see the video below: