What increases risk for oral health problems?

See below. Poor oral hygiene, not brushing teeth, not receiving dental care, and lack of Fluoride in water. Too many sugary snacks and drinks. Certainly, in adults, chewing tobacco.
So many factors. Many factors go into the strength of your teeth and their longevity. Genetics plays a role, and is something you cannot control. Within your control are social habits (smoking, dipping), as well as oral hygiene habits, diet, and frequency of professional dental care. Brushing and flossing alone is not enough. Ignore your teeth and they will go away...
Smoking is one. Also chewing tobacco. Of course poor oral hygiene. Also many systemic diseases such as diabetes and leukemia.
Bad habits. Poor oral hygiene, smoking, drinking, smokeless tobacco, poor diet. Eat right, exercise, don't drink in excess, don't smoke or use tobacco and your oral and overall health will improve. Brush and floss daily and see the dentist every 6 months. All this is a recipe for good oral health.