i've had this problem for awhile now... my dentist gave me "PerioMed" that really helps... it gives me almost instant relief... but the drawback is that it has to be prescribed by your dentist... it comes in a plastic bottle with a pump and a small cup... just put a squirt of two in the cup and fill the rest of the way with water and then rinse it back and forth over the trouble spot... (the directions come on the bottle)... but anyway... i too...have been trying the oil pulling to see if it will help... and so far it seems that it does... i've been using safflower oil which seems to do the trick...
i googled "periomed"... here is a site about "care of mouth" that offers some alternative suggestions that could prove helpful...
but it came to mind... and i was wondering how your husband feels about liver flushing... it sure helped my psorisis... maybe what he has can be cured or at least brought under some kind of control by detoxing his body... (just a thought)...