Gum disease doesn't seem very serious. After all, tooth decay is the major need for dental repair, isn't it? Gum disease begins very subtly, and, unlike decay, doesn't cause much discomfort at first. This is why gum disease can become very serious without a person being aware of the condition. A general dentist discovers gum disease through a routine cleaning treatment, but dental cleaning treatments may seem rather unnecessary if a person's teeth appear to be in good condition. This is where the fallacy lies. Gum disease is the leading cause of adult tooth loss.