Abstract: An adjustable oral device for placement within the mouth of a user to reduce or eliminate snoring. The device comprises an upper member having a substantially curved shape and defining an upwardly oriented channel for receiving at least some of the upper teeth of a user; a lower member having a substantially curved shape and defining a downwardly oriented channel for receiving at least some of the lower teeth of a user; wherein the upper member is adjustably coupled by the user to the lower member in a spaced relationship such that the lower member is positioned relative to the upper member so that when the user's teeth are retained within the device, the user's lower jaw is biased substantially forward of its normal biting or resting position to reduce snoring.