1, first help the rabbit to stop the pain, because the mouth injury will directly affect eating. If it is only for external use, it will be more troublesome to hurt his mouth, but I hope you can insist on letting him drink water, add glucose or honey to the water, and if allowed, add some anti-inflammatory and analgesic drugs (solid grinding); Squeeze some vegetable juice with a juicer, such as carrots and lettuce, and then feed it with a bottle or syringe. You'd better go to the vet. If you are in trouble, you can check yourself to see if the mandible has fallen off or dislocated. 2. Observe that its head may move. If it can turn its head, it means that its neck is just a skin injury, but if it doesn't dare to move, even the whole neck hurts. Then it's even more serious, and it may need medical help to repair it. If there is no pet hospital as you said, then it is recommended to put on gauze and add Yunnan white to help bandage it; 3, don't let the rabbit fear again, the rabbit is a timid animal, easily frightened, try to ensure that the rabbit is quiet, harmonious, warm and clean, and don't fiddle with the rabbit too much, let it rest after feeding; 4. In order to increase the appetite of rabbits, find some foods that rabbits like and are easy to eat and digest. I hope your little rabbit will recover soon!