Orthodontist question?

Why don't you look at the requirements for three or four dental schools in your area?

Speak with the pre-dental advisor at your university (if there is one).  Also look at the prerequisites for admission to dental schools that you might want to apply to.

Like medical school, dental programs require many biology and chemistry classes, but they don not require applicants to have a BS in those subjects.  The problem is that to get all the prerequisite classes, you'll end up close to completing a degree or at least a minor.  You'll have to take more classes overall to complete both the dental school required classes and those for a different major.

Biology or Chemistry would be better majors.

It doesn't matter what your major is, to get into dental school, as long as you take the dental school prerequisites. These vary a bit by dental school, but typically include 8 hours Biology with lab, 8 hours Physics with lab, English Composition, 8 hours General Chemistry with lab, and Organic Chemistry with lab. To the extent they're not prereqs, you also need to take classes in the subjects that are tested in the Dental Admissions Test (DAT).

Your major should be something you enjoy, and can do *very* well in, as you need to get top grades in *everything* (both your major, the pre-reqs, and the DAT subjects). 

Because dental school admissions in the U.S. are very competitive.  The least competitive have admissions rates of 20% or so, and the most competitive admit fewer than 1% of applicants. So you really need to choose a major that will facilitate a career in the (likely) event you won't be admitted to dental school at all. 

Frankly, I don't think the job prospects for biology majors are better than for psychology majors; neither offer a large number of opportunities for major-related jobs without graduate school. Chemistry might be a bit better, but still most jobs require graduate school. 

That said, there are many jobs (and graduate schools, such as law school) that require a bachelor's degree but in no particular field. 

I found this on the Internet:

"According to the American Dental Education Association, there's no recommended undergraduate major for aspiring orthodontists. However, dental schools typically require prerequisite coursework in biology and chemistry. Students wondering how to become an orthodontist might join their undergraduate predental society or work or volunteer in a clinic or office."

You should also google for the names of US dental schools (there aren't all that many and admission is highly competitive) and see what course work they want their applicants to have completed during their undergraduate studies.  I think you'll find it's heavy in biology, chemistry, and math.

Unless you want to go on to graduate school to become a psychologist, change your major.

Becoming an orthodontist is a long hard road. Lots of time and money. 

And be sure to have a major you like and can have a career at in case you don’t get into dental school or can’t afford it 

Unless you plan on talking people's teeth into straightening themselves out, psychology is a terrible major! 

Of course it is NO good, teeth have nothing to do with psychology. You need biology or chemistry.