Can I still use Snap-on veneers if I have only 3 teeth on my upper part? (photos)

SNAPINDENTURES OR ALL ON4 , BY NOBEL BIOCARE. There are 2 ways of restoring this , the first one could be with Snapindentures,  with 8 minimplants, upper and 8 minimplants lower,  you will have a strong support with  snapindentures,   and you will have a great result within a couple of days...

Unfortunately without any teeth you are not a candidate for a snap on smile as it uses your existing teeth as support.  You would need dental implants placed and an implant supported denture.  

Snap-On Smiles are designed to use your existing teeth as support to hold the 'snapped-on' smile in place. They typically aren't recommended to cover large gaps in the smile, such as yours. You might want to consider a dental bridge, dental implants, dentures, or dental-implant supported ...