I went for cleaning twice and it was a painful experience.
First time while cleaning/filling they couldn't find a tool and the one they had with them was broken. Assistance was running around to find it while i was lying down with my mouth open for atleast 10 minutes and finally they used the broken tool.
Second time, cleaning was so painful than i had to stop them multiple times. Later i had 4 tooth which became senstive to hot and cold. I went back and doc gave me a mouthwash and charged me $10 for it.