Sodium fluoride used in the US, UK, NZ and Australia plus others is causing havoc and producing/mimicking symptoms of other problems - hyperthyroidism, arthritis, fibromyalgia, etc - borax will clean the fluoride out but must be USED VERY CAREFULLY - it works within a couple of weeks and since fluoride is in products we use everyday as well as in the air it pays to detox every 3-6 months