Gingival veneers: how comfortable and natural looking are the veneers?

Unfortunately I have papillae loss between several of my top front teeth and it would seem the best most reliable solution would be to have a gingival veneer since gum grafting won’t work and composite bonding on my teeth will look weird as my teeth are naturally large. How comfortable and natural looking are the veneers? I’m worried it will look obvious, make my mouth/lips protrude and give me a lisp. Is this the case? Thanks in advance for your reply.