Once referred to as "flyer's toothache," barodontalgia is defined as tooth pain occurring with changes in ambient pressure. It usually occurs in people who fly or dive. Although the causal process of barodontalgia is not well understood, it may be related to pulpal hyperemia, or to gases that are trapped in the teeth following incomplete root canal treatment. Due to changes in external pressure there will be expansion of gas with compensating increase in pressure within the pulp chamber and root canal of the tooth which is defective to any underlying pathology.
"Sensitive tissue" is the sensory nerve of the tooth. Such nerve is irritated by a pressure build up of the trapped air against the decreasing air pressure outside.
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