Why don't you ask this same question in the liver forum? I think you will find more people have flushed with fillings and crowns in their mouths and have had successful flushes.
The question you need to ask yourself is how much healthier will I be without all those toxic stones? Removing fillings and crowns is a very expensive procedure and so many people can't afford the expense. Plus, it's so hard to find a dentist who is willing to remove crowns and fillings. Many people have to travel hundreds of miles to find a good dentist.