Oil Pulling Novice with questions

Hello,
Got this link from Earth Clinic. Did oil pulling for 1st time yesterday w/organic olive oil. Was able to keep it in my mouth for almost 20 mins. After spitting out there was a bit of foam but the oil still looked yellow. Again today did same thing and again, oil still looks yellow. Earth Clinic states this happens cuz you're not swishing long enuf? I don't think I could keep the oil in my mouth any longer as eventually the mouth is so coated and slick (inner part of lips too) that it becomes harder and harder to keep yourself from swallowing any or keeping a good "seal" w/lips to keep mouth closed. Anyway, is there anyone else having the issue of the oil still being yellow after nearly 20 mins?

Also, Earth Clinic gives all sorts of procedures for cleaing the mouth of the toxins after pulling and I didn't want to be mixing more stuff so I took some cayene powder (90,000 BTU), mixed in some warm water and used that to rinse my mouth real well before beginning brushing and using water pik. I'm guessing the cayenne won't nullify any of the effects of the pulling but certainly will destroy any toxins left in mouth. I'm very concerned about accidentally swallowing any of it as my immune system is in a bit of a delicate state rite now.

Any further advice would be greatly appreciated.

CJ