Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a thoroughly researched repudiation of flouride

while flouride's supporters rely on bullying,character assassination, referring to researchrather than revealing it with all of its flaws,(often due to self-interest),cronyism,and out and out fraud; this book calmly proves themwrong with simple facts from chemistry andbiology,and holds the pro-flouride camp'sown research up to a light that shows itstruly fatal flaws. a must-read for anyoneserious about their own,their family's,ortheir nation's health.