How can I make my nose stay in place and not widen so much when I smile? And how can I show more teeth? (photos)

You are suffering from an underdeveloped maxilla and the subsuquent consequences.

Three dimensional expansion with the DNA Appliance and Epigenetic expansion are the best initial approach. Patience is key as this requires 14-16 hours of wear for approximatelt 2 years. This results in both cosmetic and physiologic improvements.

May also help with appearance under the eyes and airway.

Leads to naturally beautiful smile but may require orthodontic finalization.

although more clinical studies are needed, a combination of botox and hyaluronic acid could improve your facial expression.