Embodiments of the present invention relate to an adjustable bite block for positioning within a person's mouth and maintaining the mouth in an open position. The adjustable bite block comprising at least one band of curved material comprising a first portion and a second portion. The first and second portions configured to be coupled to one another so as to define a closed loop with an opening defined therethrough, wherein the first and second portions are further configured to be selectively adjusted relative to one another so as to adjust a radial dimension of the loop, and wherein the band is configured to be positioned within the person's mouth such that at least a portion of the loop maintains the person's mouth in an open position. Embodiments of the adjustable bite block may use snap tabs spaced along the band or a ratchet mechanism for adjustment of the radial dimension.
