Since I had my braces taken off. The last time I went to my orthodontist was 3 months ago, right before I flew home for Christmas vacation. My two retainers ended up breaking at the metal part of the seam. I brought them both into the ortho, but he said it wasn’t a huge deal and I’m probably a night-time-grinder in my sleep. Which I am. My teeth obviously haven’t shifted since the seam break and it works just fine.
I love my teeth, and I’m so glad I made the decision to get braces before purchasing a car! Now I have the best of both worlds. My car needs a bit of a bath though, since not having a wash since I bought it!