since you did rinse your mouth with dilute salt water. Any wound inside the mouth will take at least couple days, if your wound is serious, it will take even longer and feel more pain. You have to rinse your mouth after you ate and you have be careful not to eat or drink anything is too hot, cool stuff is better. You even can use "Listerine" mouth wash to rinse you mouth, it will help cure. If the wound still in deep pain, you better check with the doctor.