Gum disease progresses through several stages:

1. Gingivitis: The early stage with symptoms such as gums that bleed easily during brushing and inflammation or sensitivity in the gums.
2. Early Periodontitis: Gums start to pull away from the teeth, bleeding becomes more pronounced, and bad breath may develop. Probe depths may exceed 4mm during an examination.
3. Moderate Periodontitis: Teeth may appear longer due to gum recession, and x-rays may show bone loss. Probe depths may reach up to 6mm.
4. Advanced Periodontitis: Teeth become loose or mobile, and constant bad breath and gum sensitivity occur. Probe depths can range between 6mm and 10mm, with severe bone loss.