Shikai vs Haisha

Hello,

I've been trying to find the difference between these two words for "dentist." Which word would I use during introduction? Thank you for your attention to this matter!

Hi:)
I think 'haisha' is more casual than 'shikai'

And if you want to introduce to children, you can say' haisha San'.

Thank you!!!

When compared in "Kanji" easier for understanding.

歯科医(shi-ka-i)
歯医者(ha-i-sya)

歯(ha) means teeth.
歯科(shi-ka) means dental.
医者(i-sya) means "doctor/surgeon" 医 means short of 医者.

So 歯科医 means "doctor of dental(clinc or division of large hospital)".
歯医者 means "doctor of teeth" even able to understand as children.
Also 歯医者さん(haisya-san) means "dental clinic" include "go to hospital".

ex)
A : どこに行ってたの？(doko-ni itte-ta-no?)
Where have you been?
B : 新しく出来た歯医者さんだよ。(atarasiku dekita haisya-san da-yo.)
Went to new opened dental clinc.