Oil pulling (with coconut oil)??? Tongue scraper? Water pick?

What is your experience with oil pulling? Is it safe, useful? I read that it is recommended the most with coconut oil? To squish for like 20 minutes? How about scraping the tongue? With the reusable metal scraper or the plastic tiny brush kind of looking one? What about water pick? Does it replace flossing? Please share your experience/good tips. Never tried any of these before, but would like to if they are helping to maintain a good oral hygiene. Any tips,experiences are welcome!