Might olive oil cause chipping?

Though I've visited this site several times over the past few years, I'm only registering and contributing my first post now.

I've tried oil pulling a few times since the beginning of this year. First, I started with olive oil and continued for over a month. Olive oil was quite unique in its effects compared to the other oils I tried. It left my mouth feeling "squeaky" clean, indeed to a degree that felt quite unnatural. At this point I hadn't tried other oils, so I assumed this feeling/effect was normal with all oils. Then, after a month of oil pulling with olive oil, I had a small piece of the first molar chip off two hours after oil pulling. This concerned me enough to stop oil pulling for a while. 

A month or so later, I decided to try sesame oil. I tried it for about a week, then stopped until I could get good quality sesame oil. Just today, I started using organic extra virgin coconut oil from Trader Joe's.

Now, I have a two-part question for those who have experience with different oils or are well-versed in oil chemistry:

1. Is it normal for olive oil pulling to leave you with a feeling of extremely squeaky clean mouth? I've certainly not felt anything close to it with sesame or coconut oil.
2. Might olive oil pulling be the cause of my chipped molar?

Thanks.