SYMPTOMATIC IRREVERSIBLE PULPITIS
1. Pulp damaged beyond repair. Cannot reverse or save the tooth.
2. Symptom- Unprovoked continuous or intermittent pain without any stimuli.
3. Symptom -Pain at night, sleeplessness
4. Aggravates more on hot drinks or food
5. So Aggravating factor –both heat & cold
6. Flight, high altitude pain. Pain on postural changes
7. Vital / non-vital

PULP NECROSIS
1. Pulp becomes non-vital
2. Cause- traumatic injury, progression of irreversible pulpitis
3. EPT test –ve
4. Discolouration - if it happens in anterior teeth