Final answer:
Expeller-pressed oil extraction uses high pressure and sometimes heat, while cold-pressed extraction keeps temperatures low to preserve nutrients. These terms pertain to oil production, not the practice of oil pulling, which is an oral health practice using oil to swish in the mouth.
Step-by-step explanation:
The terms 'expeller-pressed' and 'cold-pressed' refer to different methods of extracting oil from seeds or nuts. The process of oil pulling does not involve oil extraction but instead is a traditional oral health practice where oil is swished around in the mouth. However, if you're referring to the type of oil used for oil pulling, the difference between expeller-pressed and cold-pressed oils lies in their production methods. Expeller-pressed oil involves using high pressure to extract oil, sometimes with added heat, while cold-pressed oil extraction ensures that the temperature remains low to maintain the nutritional quality of the oil.
Though the original question partially confuses the process of extracting oil with the practice of oil pulling, it's important to note that oil pulling typically uses oils, like coconut or sesame oil, that can be either expeller-pressed or cold-pressed. Early oil wells were gushers, which naturally pushed oil to the surface, but modern techniques involve more complex processes such as injecting water, bending drill paths, or fracturing the rock.