Very nice combinations, 325, 324. The only thing is I wonder if it is possible to try a different shape, not a ball, with the same idea ( I am not a designer, unfortunately, I can't explain you very well, sorry.) I will send you a link were I found some interesting logos ( and shapes) for cosmetic dentistry.
http://www.logos4dentists.com/dental-logo-design-portfolio.htmlThank you.