Dentists, psychologists, and neurologists in Sweden and Norway are cooperating on the Betula Project of aging, memory, senility and health.
They discovered that there is a link between tooth loss and memory loss:
A study of around 2,000 persons in Umeå revealed a clear tendency that those who kept a full set of teeth had better powers of memory than those who lost teeth.
Gee I don't know maybe it's really about age. Older people are more likely to lose teeth to disease and rot, and as a consequence their memories get fuzzier also.
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