I went to Dr. Gene Cohen for many years, and was generally pleased. His staff is very nice, and his offices are nice also (although somewhat small and cramped). I left for 1 main reason: after seeing Dr. Cohen for many years (and for cleanings 3 times per year), he still did not seem to know me personally. Virtually every time he looked at my mouth, he asked if I had ever had gum surgery (which I did).
I also had Zoom teeth whitening done by one of his technicians and was not at all happy with the results. I had a terrible burn on my lower inside lip from the bleach, which took weeks to heal. This was in spite of the fact that she didn't leave the bleach on for the full 60 minutes (per my request).