The harm of self-diagnosis

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The only people I’ve found that say fluoride causes large problems for them are always through self-diagnosis.

Self-diagnosis is prone to error and may be potentially dangerous if inappropriate decisions are made on the basis of a misdiagnosis. Because of the risks, self-diagnosis is officially discouraged by governments, physicians, and patient care organizations.

Even physicians are discouraged from engaging in self-diagnosis. The filter solution in the image could have been a simple placebo effect.