Gingivitis can often be cured simply with good mouth hygiene-brushing twice a day and using other mouth hygiene aids.
The earliest sign of disease is bleeing of the gums. They may also look red or swollen. Gingivitis can often be cured simply with good mouth hygiene. Occasionally, even in healthy mouths, gums may become infected or sore. This is acute gingivitis and you should seek urgent dental treatment.
As the disease progresses the tissues holding them in place start to break down and pockets in the gum form around the teeth which allow even more plaque to gather. This stage os called chronic periodontitis. It is usually painless and can become quite severe if not treated resulting in teeth becoming loose, appearing to move position or to fall out.
Source: BDA Leaflet