you dont have to get real active in order to oil pull. tmj is another problem of lack of circulation and fats. my guess is that OP will help that too.
is it possible that you are taking too much salt to absorb the water and it is actually dehydrating you? do you get a flush action(loose or runny stools)? i know whaen i started doing salt water flushes every day for about a week, i was getting dry mouth, even though i was drinking lots of water. i dont think its the iodine. i know of no action of Iodine that would cause dry mouth, especially in the low amounts you are doing.