My answer to this is that 'science' has proof that the bumblebee cannot fly... but I have seen that it does.
If your experience of oil pulling for 20 minutes twice a day for two months is not enough to convince you that there are benefits, how can anyone else possibly do so. Your experience is the final word for you.
In my experience I began with virgin coconut oil after a year of dental hell.. within a week I felt better in my mouth, cleaner, more comfortable. I love the taste of coconut oil. I had no residue through the day. I soon ran out of coconut oil and got sunflower oil... BLECH!!! I hated it and could not manage to pull more than three times. I then simply waited until my ordered coconut oil arrived and began pulling again. It is not a miracle in my experience, simply a really nice way to further cleanse the teeth and gums. I have less pain, everything in my mouth feels better. That is plenty for me to pull every day.