Brush up on hygiene

Many people don't know how to brush their teeth properly. Improper brushing can cause as much damage to the teeth and gums as not brushing at all. Lots of people don’t brush for long enough, don’t floss and don’t see a dentist regularly. Hold your toothbrush in the same way that would hold a pencil, and brush for at least two minutes. 
This includes brushing the teeth, the junction of the teeth and gums, the tongue and the roof of the mouth. And you don't need a fancy, angled toothbrush – just a sturdy, soft-bristled one that you replace each month.

Brush your teeth with your ‘other’ hand, take a new route to work or choose your clothes based on sense of touch rather than sight. People with mental agility tend to have lower rates of Alzheimer's disease and age-related mental decline.