The Short Version
FDI supports good oral hygiene and recognizes that some mouthwashes can be useful adjuncts, but the claim overstates what FDI actually says. The cited FDI materials do not formally confirm that daily routines including mouthwash significantly reduce incidence of gingivitis, periodontal disease, and caries across the board. The broad tri-condition wording and strong causal language go beyond the evidence, especially for periodontal disease and caries.