Objectives: The jaw is foundational in speech, yet there is a paucity of literature regarding its role in speech sound disorders (SSDs). This investigation explores a jaw therapy program compared to standard speech therapy to determine effectiveness in improving jaw stability and speech in one participant with SSD. Method: One participant demonstrating 64% intelligibility at the single word level, and jaw lateralization during speech participated in this investigation. Receptive language and cognitive skills were within normal limits. Standard speech therapy was compared with Talk Tools� Bite Blocks and Jaw Grading Treatment protocol (Rosenfeld-Johnson, 2005), each with 4 sessions provided sequentially. Jaw lateralization and speech production were assessed at baseline and post interventions to determine jaw stability and its relationship to speech accuracy. Results: The participant demonstrated decreased jaw lateralization and inconsistent results for speech production. These included minimal changes in speech sounds accuracies, with decreased intelligibility in single words, but increased intelligibility in sentences and connected speech. Conclusions: Jaw lateralization generally decreased after four sessions of a simplified version of a jaw grading treatment program; however, changes were minimal and highly variable. This challenges whether the changes were meaningful or sustainable. Speech production accuracy also changed minimally after each intervention. Limitations included insufficient intervention sessions, practice, homework, and number of participants.
