I have rotten teeth below the gum, what are the health risks or side effects? At this time of my life they do not hurt or bother me.

Serious infections. Not hurting is not a sign of health. High blood pressure does not hurt, however it can be lethal. The same is true for rotten teeth below the gums. These infected teeth can lead to blood infections, brain infections, and even death. Please visit your local dentist for a thorough examination & consult. Take care...
Teeth. Diabetes may be more likely under certain circumstances. Abscesses, infection, tooth loss . This can affect your nutrition as your food choices lean towards highly processed("pre chewed") foods, losing more fiber and healthy fresh veggies. It becomes a vicious cycle. See a dentist.