My cleaning went well. However, what followed did not I was told that the dentist would be with me in a few minutes. Twenty minutes later, nothing. I got up and walked towards the exit, at which point someone told me that the procedure on another patient was running longer than expected. She could not tell me how much longer it would be. I left. Perhaps you could make it policy to check back with patients who are left waiting in the chair, when there is a delay.