It all depends on the legislation of each Canton. In principle, you should have a federal recognition if you want to open your own surgery. In that case you should follow the way stated before.
However, in Canton Fribourg they easily turn a blind eye to this federal requirement and provide a Cantonal recognition that has nothing to do with the SSO nor MEBEKO. In the school dental service (public service) there are Syrian, Turkisch, African, Rumanian and other foreign dentist who are allowed to work as salaried employees without having ever passed any federal examination and without supervision as it is the case in other Swiss cantons.

You can find the simple requirements here:
http://www.fr.ch/ssp/de/pub/gesundhe...sausuebung.htm