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Community water fluoridation (CWF) is debated despite evidence. A fourth controversy exists in how people trust information, requiring better communication to foster learning and evidence revision.

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Area of Science:

  • Public Health
  • Health Communication
  • Metacognition

Background:

  • Community water fluoridation (CWF) is a widely debated public health intervention.
  • Despite a strong evidence base for CWF's effectiveness, safety, and equity, public controversies persist.

Purpose of the Study:

  • To analyze the persistent controversies surrounding CWF.
  • To introduce a "fourth controversy" concerning public evaluation of knowledge and confidence.
  • To propose communication and policy strategies for improving public reasoning on contested science.

Main Methods:

  • Drawing on a comprehensive review of CWF literature.
  • Applying insights from metacognition research.
  • Analyzing CWF as a case study of contested science, polarization, and misinformation.

Main Results:

  • Controversies extend beyond CWF's technical aspects to include how individuals assess and trust information.
  • Polarization and misinformation hinder belief updating in the context of CWF.
  • Current approaches relying solely on evidence accumulation are insufficient for public understanding.

Conclusions:

  • Addressing CWF controversies requires acknowledging the "fourth controversy" of epistemic evaluation.
  • Effective communication and policy should promote epistemic humility and iterative learning.
  • Fostering evidence-informed revision is crucial for public reasoning on scientific issues.