Hi,
Firstly you have to figure out which search time you want to be found for. Having bangalore as a page name in the first instance would not be focused enough at all. You need to refine this keyword.
The second URL structure would present your search term as 'dental clinic bangalore' and would be much more focused and refined. There are local searches in India for that key term according to Google Keyword Tool so that would definitely be the way to go forward.
Make sure that you set up 301 redirects from the old URL structure to the new URL structure to maintain any link juice and you will be on your way. For a redirect I would typically give it a month until the 301 redirect starts passing through the old page authority.
Good luck.