John: For 40 years, fluoride has been added to public drinking water  According to a study, fluoridated public drinking water when given to laboratory rats causes bone cancer  Ninety percent of all the male rats in the test sample were affected, but the female rats were unaffected
Even though I am healthy now, I should nevertheless stop drinking fluoridated water; only then will I be sure not to develop bone cancer
John does not consider the possibility of other causes of bone cancer.