P.A.
Hi A.. My son, now 9, has sensory processing disorder and underwent years of ot. He also had a major problem with the dentist. First suggestion there would be to take him to a pediatric dentist. Ours had some knowledge/training in how to deal with autistic spectrum disorders, including sensory processing issues. She was very patient with him, and over the years it's improved so much that my son now has no issues with going to the dentist. He still does have some relating to food textures, so we're still working on that one. Our ot had limited training in that area, but that wasn't one of his biggest issues. He still can't eat some foods based solely on how they look...it can literally make him throw up. If it's not a visual issue, and is more of a texture one, I just make him take a few bites each time it's offered at dinner. He doesn't have to eat it all..just two or three bites. Many things that have caused problems don't anymore...but it's taken several years to get to that point.
Give your ot a chance, and make sure you're doing all the homework exercises you're given. Educate yourself as much as possible too. Check out www.kidfoundation.org. It's the website for the foundation led by Dr. Lucy Miller, one of the leading researchers today in sensory processing. Also check out www.sensoryresources.com...they have great products and have seminars across the country.
Good luck!