你没有什么感觉的原因就是因为牙髓已经坏死。
The reason that you don't feel anything is because the pulp is dead (necrotic).
其主要类型为牙髓炎症、坏死和退变。
The main changes were pulp inflammation, pulp necrosis and pulp degeneration.
外伤后，牙髓组织的转归可分为牙髓存活、髓腔钙化、牙髓坏死。
The sequelae of pulp tissue after dental injuries include pulp survival, pulp calcification and pulp necrosis.
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