The most valuable college degree in America is an engineering degree from Harvey Mudd (the small private school in Claremont, California). This has nothing to do with dentistry (other than maybe you should focus your marketing efforts on an affluent group of engineers), but interesting none-the-less.
Here is a figure estimating the 20-year return on investment (ROI) for an engineering degree from schools like Harvard, Stanford, and MIT:
Another interesting graph shows the twenty most valuable degrees in America, claiming a computer science degree from Stanford to be #1.
