This essential tool is used in the famous activity ?Bite Block hierarchy.? Jaw Grading Bite Blocks promote symmetrical jaw strength, stability, and grading for clients with weak jaw musculature evidenced during speech sound production or feeding (i.e. reduced mobility, sliding, or jutting). As many OPT (Oral Placement Therapy) tools, it is used both to diagnose and treat. Excellent for use with Dysarthria, Apraxia and Dyspraxia.