When does a tooth become non vital? At rootz dental care navalur, Best dental clinic. A tooth becomes non-vital (also known as a dead tooth) when the pulp tissue inside the tooth dies. The pulp contains nerves, blood vessels, and connective tissue, and it plays a critical role in the development and nourishment of the tooth. Causes of Pulp Death (Tooth Becoming Non-Vital): 1. Dental Caries (Tooth Decay) 2.Dental Trauma 3.Cracks or Fractures 4.Severe Periodontal Disease ⚠️ Signs a Tooth Has Become Non-Vital: No response to hot or cold tests. No response to electric pulp testing. Discoloration of the tooth. Swelling or abscess formation. Foul smell or bad taste. Pain while chewing or tapping. Sometimes, no symptoms at all (silent necrosis). Treatment Options: 1. Root Canal Treatment (RCT) 2. Extraction