What is pyorrhoea?

Purulent discharge.: The definition comes from the greek, meaning a discharge of pus that is related to inflammation and infection. It is most commonly used by dentists to describe periodontal disease, since discharge around an affected tooth is how this condition presented. This usually leads to inflammation of the dental periosteum, with progressive necrosis of the alveoli and tooth loss.

Gum disease: This is what they called periodontitis (gum disease) back in the days.

Periodontitis: Pyorrhea is an old term for periodontitis. Periodontitis is a disease of the gums, alveolar bone, and all the structures that surround the teeth and hold them in. Pyorrhea is also a term meaning purulent exudate or pus.