Oil pulling is an alternative medical practice in which an edible oil is swished around the mouth for a period of time and then spat out, similar to mouthwash. It is a popular natural remedy for detoxing the mouth and improving oral health. It is an ancient practice believed to help remove impurities from the body and improve oral health. Does Oil Pulling Work? There have been numerous studies on oil pulling's effect on oral health and hygiene, and discussion about which type of oil is best. One study noted that oil pulling was as effective as chlorhexidine, a prescription mouthwash, in the reduction of Streptococcus mutans, the bacteria believed to cause tooth decay. Another study published in the Journal of Natural Science, Biology and Medicine concluded that oil pulling is effective in reducing the severity of gingivitis.