Pulpitis by definition is inflammation of the tooth pulp. The pulp is the inner part of the tooth that consists of blood vessels, nerve endings, lymphatics, and connective tissues. In pets the most common reason for pulpitis is traumatic force to a tooth, either from blunt trauma or chewing on items that are too hard.
These teeth often appear discolored (pink, purple-to-gray). Because the pulp is enclosed within a hard rigid chamber, any inflammation can rapidly increase inner pressure and restrict blood flow. Eventually, pulpitis most often progresses to pulp and tooth death.
Full article Apex Dog and Cat Dentistry: Discolored Teeth (Pulpitis)
Filed under: Discolored teeth, Pulpitis