Oil Pulling: Unlock Natural Oral Health & Detox Benefits

I've been Oil pulling for about 5 weeks with coconut oil. I use about 2 teaspoons in the morning and let it melt in my mouth. I've worked my way up to 17 minutes in the mouth. The most immediate change is I no longer suffer from almost daily sinus headaches. My teeth feel cleaner but unsure if they are actually whiter. My skin feels not as dry. Just the change in my sinuses is enough for me to continue. Do you guys change your oil every few months and do you oil pull more than 1x per day? Thanks