So glad I had my PST gum surgery done by Dr. Chang. Unlike my previous dentist, he is up to date on modern procedures. My second day – absolutely no pain. Actually, I had no pain the first day. Had three teeth done at the same time. Now I am ready for the rest of my teeth to be done, with no hesitation. Gum grafting is so old school. I am so glad to have Dr. Chang as my dentist!