Thanks for all that information. That's what I was looking for. And yes, I'm having great success so far w/the castor oil. On my 6th day now. And I've noticed my teeth are even whiter than w/the safflower and coconut. As I said, the castor is quite thick for about first 5-8 mins so you're really working at swishing but then thins out. Or perhaps it would be different w/someone else depending upon their body chemistry. I'm going to continue to switch oils every so many weeks to see what happens. I only just started oil pulling at beginning of Dec. '06 but w/great results thus far.