Orthodontics always requires more education that dentist work. This is because an orthodontist is a further specialization of dental care.
Business school.
While most university degrees can be earned in two to four years, there are several that take considerably longer. Any type of doctorate degree will require at minimum six years of schooling. Engineers can look forward to 8+ years of schooling, as can dentists and anyone else who would like to be board certified.
Any accounting position will require a fair amount of schooling, and a contact accounting job is no different. At a minimum, a person seeking this type of employment will require a bachelors degree.
The only operating rooms jobs that may not require schooling or experience would be cleaning. Any time someone is assisting in a surgery, special training is required.
Most careers require that a person has some sort of college degree. Most states require a bachelors degree or 4 years of schooling to become a high school math teacher.
4 years undergrad taking the prerequisites for that career and 4 years grad school. Then you can specialize if you like, which would require more school of course.
Here's a link to a website that will help you learn what schooling you need to become an emergency medical technician and find the school best suited for you. Good luck! http://www.schoolofemt.com/
Education is mandatory in the US. Most states require schooling until the age of 16. There are alternatives, such as home schooling, but it requires meeting specific curriculum requirements.
9 years because the more u know the better you do
Some therapists or psychologists can practice with only a Master's degree.
Most states require training at a trade school. All that I know of require licensing as well. Your state's official website should have more information.
Most dentists have a 4 year undergradute degree before attending dental school. A degree is not necessary, but basic prerequisites must be completed before attending dental school. This usually takes several years to attain. General dentists attend dental school for four years although there are a few three year programs out there. Some states require a 1 year residency after graduation. Dental specialists such as oral surgeons, orthodontists, periodontists, etc. attend a additional 2-8+ years of schooling.