... within 6 months of starting use of SF 5000 Plus 1.1% sodium fluoride dental cream? I have been using the product per dentist's orders and by prescription since Dec 2010. Using twice a day with instructions not to rinse for 1/2 hour after use and not to eat or drink within one half hour of use. Unfortunately the product makes my mouth salivate, and I either have to stay by the sink and spit for a half hour or eventually give up and swallow saliva. I've swallowed the saliva after spitting multiple times into the sink. Have not felt well since April 2011 and have been diagnosed with both Graves Disease and Hashimoto's Disease.