So You're Thinking About Oil Pulling..

Oil pulling is an Indian folk remedy that has been used traditionally to strengthen teeth, gums, and jaws and to prevent decay, oral malodor, bleeding gums and dryness of throat, and cracked lips. 1-2 teaspoons of sesame, olive, or coconut oil is placed in the mouth and swished around for 15-20 minutes, and then spit out. Some sources suggest that this removes toxins, plaque and bacteria from the oral cavity. A 2009 study involving 20 participants gave half of the participants a chlorhexidine mouthwash and the other half sesame oil. Results showed that both groups had a reduction in plaque and aerobic microorganisms in the mouth. Another 2011 in lab study (in vitro) suggested that sesame oil did not have antimicrobial affects but the process of oil pulling could lead to emulsification and saponification (process that produces soap) which could help clean the oral cavity. To date, most scientific studies involve few participants; positive results in 10 individuals don't necessarily predict what would happen in every person, therefore studies with larger participant numbers are needed.
The Cleaveland clinic suggests that oil pulling may be used as a mouthwash to maintain oral health but is not a replacement standard oral hygiene recommended by your dentist.
Currently there is no scientific evidence to prove that oil pulling improves or cures chronic diseases. However, it is likely a safe to use as a natural mouthwash as long as you're don't forget about that toothbrush and floss!

Information Sources:
http://www.ncbi.nlm.nih.gov/pubmed/21911944
http://www.ncbi.nlm.nih.gov/pubmed/19336860
http://www.ncbi.nlm.nih.gov/pubmed/21525674
http://health.clevelandclinic.org/2014/04/is-oil-pulling-your-best-choice-for-dental-health/