A study comparing the prevalence of decay on tooth root surfaces in two groups--middle-aged adults (aged 45-64 years) and older adults (65 years and older)--shows differences between the two groups. Middle-aged adults seemed to be prone to this type of decay if they were male, self-reported dry mouth, had exposed roots and increased frequency of eating or drinking between meals. Older adults did not share the same associations.
Source: JADA, vol. 144, no. 5, 507-516
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