Question

water fluoridation and cancer risk
in assessing whether fluoridated water can cause cancer, what do the national research council, national health service, and centers for disease control and prevention all agree on?
osteosarcoma is so rare that there is little need to study the risk of fluoride.
fluoride should not be added to water according to research from dentists.
there is a need for further research.

Explanation:

The National Research Council, National Health Service, and Centers for Disease Control and Prevention generally recognize the need for more research when it comes to the relationship between water - fluoridation and cancer risk. Osteosarcoma being rare doesn't mean no need to study fluoride risk. And there is no consensus among these organizations that fluoride should not be added to water based on dentists' research.

Answer:

There is a need for further research.