I have oil pulled daily for years. Recently I had to have a crown removed because the tooth underneath had some decay. I have the temporary on even as I type. So, I don't know how much good oil pulling does for crowned teeth.
Clove oil proved to be a very helpful remedy in tooth ache.I had my root canal treatment from "United Dental Care" and they had also applied a crown over the filling.You can use oil but before this you should consult to your dentist first.
Oil pulling clean your whole mouth and not just your teeth. Teeth are 10% of your whole mouth. If you will keep your whole mouth clean, you will keep your mouth and teeth healther with or without crowns.