While seldom painful and frequently free of any obvious signs or symptoms, periodontal disease can progress, undetected, to the point where supporting bone is destroyed. With 80 to 90% of all teenagers having some form of gingivitis (inflamed gums) and 75% of adult tooth loss for people over the age of 35 due to periodontal disease, early treatment and prevention is essential. While periodontal disease is caused by plaque, a number of other factors including poorly fitting bridges, badly aligned teeth and defective fillings contribute to the development of this condition.