That's odd. In the autopsy, it states that WH's lower teeth were all intact, and were her natural teeth. She had a section of her upper teeth which were artificial, but which were permanently anchored by dental implants.
I am sure Cissy had difficulty accessing WH's home during her drugged out days because WH wouldn't want her mother to see how she was living and intervene.
In her interview with Oprah, she said her mother was persistent, and finally forced her hand. She claimed that she was grateful for this now (at the time of the interview), but that when Cissy was using tough love (threatening to get LE involved), she was not so accepting of her mother's interference.
As to not being a nice person, I think the problem with celebrities is that they don't keep people around them who can be "HONEST" with them about their behavior. So they get really spoiled and start believing all the "yes" people they surround themselves with, and eventually do come to believe they are better than everyone else. The "yes" people constantly feed this delusion because they either want something from the celebrity, or they are too afraid of losing their position in her life if they actually try to hold that person accountable for bad behavior. It happens a lot.
