I have a site where I sell many different products, each with their own product page. I used to have the number 2 and number 3 position on the first page of google for 2 items that were variations of each other(one regular and the other a different flavor/ scent). Google panda update knocked'em out. Now I have someone writing some better product descriptions so that my backlinking may be more effective. However, I've searched google a couple of times for those particular product pages under the keyword phrase I've always used(backlinked) for them. I go through about 50+ pages of results and I don't see either page. I see other pages from my site for OTHER variations of the product, but not those 2 that were on the first page in position 2 and 3 prior to the panda.
So I'm just wondering if google deindexes only select pages from a site rather than a whole site altogether. And if so, will adding better content cause them to reindex it or should I just focus on other products because that's just over now?