I say go for it.
Its been at the top of my list of software I have basically no interest in working on yet feel like I could do a hell of a lot better at anyway. Of course, I haven't researched what's out there, there may already be much better options available.
Besides being ugly, my main beef is that I have watched her drag photos, one at a time, into their proper slots in my "file" from the incoming area, even though they were already clearly labelled as to what tooth they were pictures of. It's maddening. It's only a minute or two, and she doesn't take pictures every visit, but it's the kind of thing that just screams shoddy workmanship... and opportunity.
Are you certain that is a software problem? It could well be a user education problem, or a trust issue between dentist and program.
We have been trying to crack in to this niche for almost two years with our http://patientboost.com/default.html service but it is a damn challenging market.
Having a good website will get you a competitive advantage in the market segment I'm a part of. (And my segment, people who don't want to deal with automated call systems or dead trees of phone numbers is growing every day.)
However if you are offering Cosmetic Dentistry, each new client can worth thousands of dollars and people will travel from their immediate surrounding to go reach your dentist practice.
Furthermore, there are places that I go to regularly whose easy access to info regarding hours and menu causes me to go there more often. Here is one from a place I like: http://eathomegrown.com/ Could be better (uses flash), but the info I want is there. And they have a blog and social media presence. All this has resulted in more than a few conversions into sandwich purchases from me, personally.
You can't make money if you can't even get customers in the door!
mediocre food and superb service gets customers better than superb food with shitty service.
I can see see a way that ... nevermind, i'll just go do it rather than let someone beat me to it.