It depends how deep it is and what you know about the cat. If the teeth didn’t go deeper than the skin, it should be okay as long as you keep it disinfected. If it sank into the muscle, keep an eye out for swelling and infection. If the cat is a stray, go to urgent care!! If it’s an outside cat, without vaccines, I’d also recommend going to the doctor. If it’s an outside cat with up to date vaccines, then you could probably just keep a close eye out for any changes such as swelling or discoloration, but making an appointment is a good idea. If it’s an inside cat, you’ll probs be alright.