I use sunflower oil(not organic though)and have started since 5 months
I swish every morning, first thing for 15-20 min and clean with cold distolled water with Sea Salt
The only noticeable improvent I have is that the metallic taste from my tongue disappeared completely. Sometimes when I swish more than once a day it causes me to have more BM.I now feel my mouth clearer, but no difference in the teeth color.(as far as bleeding gums, it stopped when I replaced my 11th Amalgam 2 months ago)
My father also was swishing long before me, but has ammeliorated the technic now with my recommendations
No other person seems to be positive towards oil swishing(although some of them know a person here of getting rid of his heart problems by oil swishing alone). They find it tiring.