Dr Chang is a very nice person. I went to his Clinic for cleaning several times. He is patient and take care of the patient very well. However, he didn't handle my case properly. He should refer me to a specialist earlier, rather than recommend something to me. Overall, Dr Chang himself is a family dentist, NOT a specialist to diagnose my situation.
I was referred a specialist after the third visit at the clinic. Therefore, I might have missed the good timing for earlier treatment.
If you just do a cleaning, maybe it is the place to go.