I had my wisdom teeth pulled a month ago and i still see a hole. is that normal?

Yes: Depending on the amount of tissue and bone remaining at the time of surgery and their contours, and your post-op compliance, this can be very common. Usually this resolves and minimizes over time . How long ?? - varies with everyone. As long as you keep the area clean it should resolve just fine. May still have little indentation, though. Good Luck.