No problem, I am sure we can come to a sensible resolution.
If all of your site is related to dentist then I think I would leave that out of the folder names and use the other terms like cavity or root-canal as the folder names.
If however your site is about various different services in different cities then you have a few options.
Possible folder and URL structures.
- somedomain/cavity/somecontent
- somedomain/city/cavity/somecontent
- somedomain/somecontent
- somedomain/city/dentist/cavity/somecontent
- somedomain/dentist/city/cavity/somecontent
- somedomain/dentist/cavity/somecontent
There are pros and cons to each of the above and it really depends on where your site breaks down into different offerings of content.
If your site is all about dentists and you have different content for each city then option 2 is probably good as it will help visitors and search engines see they are in the right place.
if you have different services and the content for each city is different then option 5 may work.
The big question is how and where you differentiate your content. There are loads of options but the main thing is to make sure it is consistent and that you are not duplicating content across pages. The duplication of content also means you are not using the same content rehashed with different city names in it. (sorry if i am teaching you to suck eggs).
To be able to give a more detailed answer i would need to have a look at the site or for you to provide more detail or examples.
I am though more than happy to help as best i can.
I have just been looking for sites that may have similar issues but cant find any, can you share what the site does in more detail without giving away information you do not want to share?