The entire business model exists only by not informing you of everything that can go wrong.
Ironically I now know more about these procedures than I ever did before, and all I've learned is how the entire industry is aligned to not tell patients about what things effects the outcome and how little they actually can do if the results are not good.
Edit : If you google lasik/Smile complications and so on you'll just find a rabbit hole of despair from people who had their eyes ruined. I'm kinda amazed that medical professionals actually has the conscience to perform these procedures. Theres also this tendency to blame dry eyes - which is just the industry's way of camouflaging the real issues.