The aftermath. After the green python's lower jawbone folded and got stuck in her throat, it left Toothless with an overbite. It caused her to resemble a 'perturbed Muppet."
Reacting to the incident. When the animals noticed that their animal was in distress, Toothless was immediately taken to the hospital. When they arrived at HerpVet, the snake recited and X-ray and it revealed that she had a broken jawbone.
Short on options. Snakes are pretty small creatures compare to other animals, so that means that they have small bones too. The doctors at HerpVet knew that they couldn't do a surgery on her because the bones were too small and fragile to mend.