Hi Ali and
Dentistry appears on the
Immediate Skill Shortage List . This is not the same as the Long Term Skill Shortage List because you can't automatically get residency from it.
In NZ if you want to work in dentistry you will need to be
registered . I think, possibly, you may also need to have
a minimum of 2 years work experience to qualify under the General Skills Category.
The
IELTS pass level is 6.5. The link will give you some background information on the system.