Dentists and psychiatrists in the UK studied almost 7,000 people aged 20 to 59 and found that gum disease was linked to poor cognitive ability for youngsters as well as oldsters. Inflammation due to gum disease causes damage to white matter in the brain, which results in deficient mental function. Another study at Columbia University found gum disease linked to dementia and Alzheimer’s. The upshot is, psychiatrists are now advising you to floss in addition to brushing.