Is lip repositioning surgery permanent for gummy smile and in what period of time does it relapse?

Hello.  The issue you are speaking of can easily be corrected with a few units of Botox/Dysport. I have been successfully using Botox and Dysport to correct smiles for more than 10 years. 

It's difficult to make a treatment recommendation without an in-person consultation, although your photos do suggest that you're a good candidate for a non-surgical option, such as the ones you listed. In my practice, the lip lengthening option is quite popular as its results are typically...

You can get some corrective gum surgery to move the lips down. The other option is to move your whole jaw bones in the upper teeth upwards with what is called maxillary impaction and orthognathic surgery. Don't worry there are people out there that can help.