You do crown lengthening for upper central incisor after lengthening you should wait 6-7 months for:
a. Cementum formation
b. Periodontal maturation ***
c. Junctional epithelia formation
d. Epithelization
The tissue will take 6 months to fully mature, but the restorations can help a lot in closing the space. To "fine tune" the tissue, some Juvederm can be placed to plump up the tissues if you are not completely happy.