Hi Satchi, my understanding is a doctorate of any type enables you to be addressed as 'Dr'-however, I think that there is a convention whereby you either use the address
'Dr Sally Jones' in print OR 'Sally JOnes D.H.Sc' (or Sally Jones PhD-whichever it is).
What you don't do is say 'Dr Sally Jones D.H.Sc' or 'Dr Sally Jones PhD'.
I also think that some people choose to use the form which just places 'letters' after their names to avoid confusion with medical doctors. Esp. in professional situations.
An example is that as a teacher, I probably won't use my PhD to be called 'Dr' (when I get it that is!-three or four years from now). I will probably still call myself Ms Pjlu professionally but in professional written communications and dealings I will use
Ms PJLU PhD, MEd etc, etc.
(Unless I get work as an academic, or in the top level of educational systems or in government-probably unlikely at this stage in my life-sigh!).