the clogging up the plumbing comes from the higher melting point (~35 degC) of fully hydrogenated oil. Virgin oil is still relatively high but ~25 degC. It has a relatively low smoke point so that can be problematic but i suppose problems can be avoided depending how and what is being cooked. Maillard reactions can be wonderful things.
When i was working in SLB i had a load of lab grade, virgin coconut oil i was using for some of my research. When they closed the lab we were supposed to throw everything away but i kept the coconut oil and used it for cooking for a long time.
just a WAG on your observation regarding the effect on your tooth: might be related to surfactant or antibiotic effects of the acids in coconut oil. Coconut oil also contains sterols which might have an anti-inflammatory effect.
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