Brushing and flossing teeth has little to do with gum disease or erectile problems.
Brushing and flossing teeth cannot repair a deficiency, only adequate nutrition can, including optimal vitamin C, calcium, magnesium, selenium, etc.
Animals don't floss or brush. This can result in bad breath, however as long as they get the nutrients they need, their teeth will be fine and they will not have receeding inflammed gums, which is nothing more than arthritis of the jaw bone... a common calcium/magnesium deficiency.
If half of the men in the above study had beards, would we assume that beards are responsible for erectile issues? Of course not... the study would be flawed if some of the men were deficient in vitamin D for example, or any of the 90 nutrients..
There are several reasons why erectile dysfunction occurs, from stress to vitamin/mineral deficiency, however, the single largest reason is due to lack of cholesterol, which is usually caused by a combination of statin drugs and low cholesterol diet...or in laymans' terms...following doctors orders.
Erectile dysfunction is an early warning symptom of Alzheimers...which is severe cholesterol deficiency. Brushing and flossing your teeth is fine, however has really nothing to do with cholesterol deficiency.