Original sentence: Opposition to water fluoridation primarily exists because of a concern over what some believe to be a lack of quality research demonstrating its efficacy and safety, a fear that it may cause serious health problems, despite medical evidence to the contrary, and a general resistance to the idea of compulsory 'mass medication' which takes away an individual's right to choose
Edited sentence: Opposition to water fluoridation primarily exists because of a concern over what some believe to be a lack of quality research demonstrating its efficacy and safety, a fear that it may cause serious health problems, despite all medical evidence to the contrary, and a general resistance to the idea of compulsory 'mass medication' which takes away an individual's right to choose