What are the desired outcomes of botulinum toxin treatment for a gummy smile as described in the chapter?

The desired outcomes of botulinum toxin treatment for a gummy smile include lengthening of the upper lip to reduce gingival show and nasolabial folds, while maintaining minimal functional impairment of the mouth.

The treatment aims to inhibit the contraction of the levator labii superioris alaeque nasi muscle, which results in the lengthening of the upper lip and a reduction in the gingival show associated with a gummy smile. Additionally, the treatment should reduce the prominence of nasolabial folds. It is important that the treatment does not significantly impair oral functions such as eating, drinking, and speaking. The effects are typically assessed two weeks post-treatment, and adjustments can be made if necessary to achieve the desired aesthetic results.