Fig. S1. Instruction for promoters for cost persuasion.

Fig. S2. Personal water budget sheet for individual households.

Fig. S3. Instructions for promoters for vulnerability persuasion.

Fig. S4. Water sources fluoride chart indicating grade of contamination of each accessible source in the village.

Fig. S5. Pictures of people suffering from dental and skeletal fluorosis.

Fig. S6. Instructions for promoters for information about prevention of fluorosis.

Fig. S7. Risk graph showing the risk of getting fluorosis.

Table S1. Factors, items and response options with corresponding values.

Table S2. Means and standard deviations for each group during baseline.

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