I have a dwarf rat named Gizmo that had lost a bit of weight so I took him to the vet, about a week ago. While he was there the vet said his teeth looked fine. Looking at him today I noticed his mouth open and his teeth are crooked. They look like it’s going into his cheek. Can this happen in a short period of time? I will set up a vet appointment but I don’t want to waste money if I can solve it on my own. I added a picture if it helps, thank you!