I went to Dr. Ngyuen for 2 root canals. I have had other root canals before and never have I been treated so harshly. The primary harshness was the force with which he performed the procedures. I know it is important to clean out the canal, but good God, I thought he was going to break my neck with the repeated force applied, dozens of times. I have never had so much pain after a procedure. Also one of the teeth become cracked within 2 weeks, no doubt because of the force he had applied to it. So I lost the tooth anyway. He is also not very friendly or comforting. I would never recommend this endodontist to anyone - steer clear.