【英语时差8,16】怎样清洁大脑（上）（在线收听）

 Studies suggest that gum disease, especially, can affect the brain. Some studies have found that older people with gum disease are more likely to have memory loss and other cognitive problems like dementia. But isn’t it possible that people with memory loss or dementia are more likely to forget to brush and floss their teeth, which would lead to dental problems? In other words, maybe memory loss causes poor oral health, instead of the other way around. Could be. But there’s compelling evidence that gum disease can lead to cognitive disorders. Such as?