Accuracy of Stackable Double Periodontal Guide in Esthetic Crown Lengthening

The goal of this clinical trial is to find out if a new digital surgical guide helps dentists perform esthetic crown lengthening more accurately than the current digital guide in adults with a gummy smile caused by altered passive eruption. Esthetic crown lengthening is a procedure that reshapes the gums and the bone around the teeth to show more of the natural tooth. The main questions this study aims to answer are: Does the new digital guide help dentists reshape the bone and gums more accurately? Does the new digital guide improve healing, the appearance of the gums, the time needed for surgery, and participants' satisfaction with the results? Researchers will compare a new stackable digital guide with the current digital guide to see if the new design provides more accurate and predictable results. Participants will: * Be randomly assigned to have surgery using either the new digital guide or the current digital guide. * Have dental examinations, digital mouth scans, and three-dimensional dental X-rays before surgery to plan their treatment. * Have esthetic crown lengthening surgery using the assigned guide. * Return for follow-up visits right after surgery and again about 6 weeks and 6 months later so researchers can check healing and compare the planned treatment with the final result. * Answer questions about their satisfaction with the treatment and any pain medicine they used after surgery.