Gingivitis is an early stage of gum disease. Gums become tender, swollen and likely to bleed. This generally can be stopped with proper oral hygiene and treatment from your dentist.
The gums deteriorate and begin detaching themselves from the teeth forming gum pockets, which allows plaque to collect below the gum line. This causes tooth roots to become susceptible to decay.
A radical amount of gum tissue and bone tissue is lost. Teeth become loose and may even need to be extracted. This causes difficulties in normal everyday chewing and biting habits. If advanced periodontal disease is left untreated, patients run the risk of other serious health problems.