Dental Pain Imagine for a moment that a new gene can be given to you which could make the earliest cancer growths in your body to cause intense pain. You could go immediately to your doctor and have the cancer treated when it was most easily defeated. Deaths from cancer would be almost eradicated. If you wait for cancer to be painful before seeking treatment, you know you are waiting until you are already doomed.
Teeth are exactly the same way.
They don't hurt until it is to late. Or more accurately, too expensive for all but most wealthy to rescue. Fortunately, any competent dentist can rescue a tooth after it hurts, but for a lot of money. Every dentist secretly wishes your teeth would hurt MORE than they do. These people have inherent self-discipline, are more educated, and plan for the future.