first...odd to tell us you're deleting this...any reason why?
Second, no two sciences are not too much to take in one semester. In fact, depending on your major, that may be too little. if you are a biochem major or bio or any science major, you will need to take more than 2 science courses a semester to graduate in 5 years or less...unless you have an oddly low # of science classes required for your science major.
If you are a non-science major, schools will want to see that you can handle a decent courseload of science courses all at one time. Consider having at least 1 semester with at least 3 science courses and 1 or 2 other courses to prove that you can handle the dental school 34 science credit units per semester courseload during the first couple years. Of course, temper your courseload to match your other issues, like # of hours at work or volunteering, and family, etc.