Hi buschtall-ga, and thanks for your question.
There is a group in Washington that serves exactly the need you
describe. I just noticed that Pink posted a comment describing this
group, so I won't post this as an Answer.
The Decod program at the University of Washington School of Dentistry,
which began in 1974, trains dentists to travel in the community
delivering care at patient's homes who wouldn't otherwise be able to
receive dental care. Here are two articles on the program from
BizJournals. You may need to register (free) to read these.
Here is contact information for Decod:
Teaching and research in the education and care of persons with disabilities
Administration, B-316 Health Sciences, 206-543-1546
Clinic, B-239 Health Sciences, 206-543-4619, FAX, 206-685-8412
Glenn Govin, director
Here is a page (aimed at seniors) with some rates and more information:
washington dentist house calls