How often should I brush my teeth?

your dentist will tell you at least twice a day, and preferably after every meal...

What do you eat, how often and what is your ease of living?

At least once a day before bed, at best after every meal, before bed and when waking up.

Region is correct, and flossing once a day (preferably at night) is highly recommended.

My dentist has a sign that reads "You only need to floss the teeth you want to keep."