How long does it take to be a dentist

It depends on what country you live in, what type of dentist or dental professional you would like to be, as well as what training/education you have already received.

The best place to learn about careers, education and training is from that profession's credentialing or association website.

For dentists (and other dental professions), you can go to the American Dental Association: http://www.ada.org/education.aspx

Good luck!