Wash it out once or twice a day with water had nearly the same thing happen to one of mine but lower jaw and was pretty bad but healed up fine
hes right....the mouth heals pretty fast....just be sure one of the two times is after he eats(so he doesnt have food stuck inside the wound) it wouldnt hurt to give him some pen. too. The mouth is full of bacteria. i would keep flushing it out till it granulates in (closes up). Good luck! Mrs. kbar