Do you mean a periodontist?... You need to have graduated with a bachelors in some field of science (usually). Then apply to dental school, four years of that, and then you have to specialize in periodontics, another couple of years.
what qualifications do you need to become a general practitioner
what qualifications do you need to become a health visitor
you have to be male
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You need talent to become an actor
a PHD in psychology.
gcses
You don't.
Learn how to spell...
GCSE
you need to have A in maths and business