Usually dreams about teeth problems, zits, and such are more about personal insecurities and limited self confidence or esteem, rather than your hygiene routine.
The thing too is that holes mean something has been removed, are emptied or need to be filled. If you can't find what you need with in yourself to fill the hole, look for it from other resources.
Hope that sounds right. If not, Dream Moods has other imput about Teeth Dreams you may wish to look at.
http://dreammoods.com/cgibin/teethdreams.pl?method=exact&header=dreamid&search=teethintro