A sanitary mouth shield assembly including a headset with multiple locations of adjustability, both linear and rotational, in order to accommodate a variety of head sizes. A pair of side portions support therebetween a bridging and arcuate extending, length adjustable band. A shield sub-assembly is supported by the headset and includes elongated and arcuate side supports which are rotatably and adjustably secured at first ends to exterior side locations of the side supports. The shield sub-assembly is rotatably supported to extending ends of the sides supports and in turn exhibits a combination arcuate and planar shape. A base component of the shield subassembly includes a pair of end supported clips. A fibrous filter element is sandwiched between an inner surface of the base component and an attachable retaining component, the retaining component including lateral projections which seat within the clips to secure the subassembly in place. The inside bottom and proximate side edges of the base component further exhibit a fluid retaining trough.