An athletic mouthguard with lung exercising variable, two-way airflow-restricting valve is disclosed. The mouthguard has a mouthpiece with a lower tooth bed and an upper tooth bed overlying the lower. Outer and an inner sidewall connects the beds. A channel passes between the lower and upper beds with a first end open within the inner sidewall and a second end open within the outer sidewall. Certain embodiments include a channel wall which separates the channel into multiple channels. A manifold in fluid communication with the channel terminates to a centralized aperture with a valve seat. A rotatable valve member in the valve seat has an aperture therethrough.
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