Serious dental and gum diseases can still occur despite diligent brushing and flossing. See your dentist regularly so any issues may be addressed before they worsen.
To do this affordably, get a Dental Plan through your association and AMBA to cover exams as well as the unexpected.
Grinding one's teeth can cause teeth to loosen, or can be an indication of untreated gum disease. If the problem is not addressed, the tooth might become fully unstable and fall out completely.
Over 90% of bad breath is caused by bacteria in the mouth. In your mouth alone, there are around 700 distinct species of bacteria. Keep your mouth as clean and healthy as possible with regular brushing, flossing, and visits to your dentist.