One after the age of 12, basically have been permanent teeth, that is to say, as you age, unplug tooth could no longer grow new teeth. You go to the dentist, after the doctor's treatment, your defect cavity filling up with a special material, and how are you feeling good teeth will be the same. As long as there is the treatment of one percent hope your teeth, you don't give up.
Why there is a clear line on the gums?
Your gums and mucous membranes are not abnormal. It is normal in the inner concave. You can see the family. In addition, you may have a congenital shortage of teeth and two front teeth. So now looking at your teeth is a little sparse, and in the photo, your teeth have stones, suggest you have time to do the mouth cleaning (teeth cleaning).