I have a student that backs sounds meaning he has difficulty making /t/ & /d/ sounds. Do you sell a horn that would help?
School-Based Speech-Language Pathologist
I am so pleased you decided to contact us as the Horn program has been very beneficial for so many of our child clients with muscle-based articulation disorders.
The question you asked is an interesting one. I will try to answer it with as much information as I can. The TalkTools Horn Hierarchy was developed, with the help of an engineer and palatograms, to address the following speech systems: grading in the muscles of the abdomen, velum, jaw lips and tongue. So, you can see that one horn will not correct a phoneme error such as the one you mentioned.
The hierarchy then addresses all of the muscles in the tongue needed for standard speech sound production on the conversational level and is only one technique used to treat the /t/ and /d/ placement errors. In most cases for those phoneme errors I would use the Horn Hierarchy in conjunction with the TalkTools Straw Drinking Hierarchy.
Because you seem to be interested in using Oral Placement Therapy (OPT) I would encourage you to attend a class or watch the video of my our 2-day class: "A Three Part Treatment Plan for Oral Placement Therapy." In it you will learn how this therapy works and step-by-step instructions for how to implement the Horn and Straw Hierarchies in addition to numerous other techniques to improve speech clarity.
I hope this has answered your question,