How to use META description tag on WP dynamic content

Since we have dynamic pages in WP, should we use the META description tag ?
It it so, wouldn’t we run into a problem with the search engines indexation ?
I mean having different content everyday with the same description…
On the other hand, if we don’t use it we will be indexed with no description..
I know there has to be a fix for this. I didn’t find it thought.
If anyone knows about what to do, please let me know.

Thanks again.