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Yes but then how get a good on-page optimization if you are doing like 10 keywords per page? I mean, it's not possible to put 10 keywords on title, h1, url etc. Don't you think Google will question what the site is all about if you go more than 2-3, it's just becomes very difficult.

I don't want to over optimize by doing 1 keyword per 1 page, but then if I do more, seomoz on-page tool report doesn't give an A grade for each keyword I optimize.

I usually optimize for max 3 keywords that are very closely related, meaning they use the same words.  Ex.

dentist los angeles, los angeles dentist, dentist in los angeles

Am I on the right track or what's your recommendation? Should I create different landing pages for each keyword?