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Table 17: Summary of strength of evidence linking diet to periodontal disease
Evidence Decreased risk No relationship Increased risk
Convincing Good oral hygiene   Deficiency of vitamin C
Probable      
Possible     Undernutrition
Insufficient Antioxidant nutrients Vitamin E supplementation Sucrose

Source: WHO/FAO "Diet, Nutrition and the prevention of chronic diseases"
Section 5.6.4 Strength of evidence