Dentist here. Actually your review wasn't too bad. I don't think it merits being taken down, and certainly needs addressed.
However a dental practice is governed by regulatory bodies, and a well managed practice will have a practice complaint policy to hand. The details are supposed to be displayed at reception.
The fairest way to resolve this matter is to ask for a copy of the complaints procedure and follow it. In that way, all will be documented correctly, responses give. In writing, actions taken etc etc followed...
It's definitely the most preferable manner to proceed all round. As a practice owner I try to take complaints of this nature seriously and see them as a learning experience.
Honestly to go in all guns blazing, posting on social media without going through proper channels I think is a bit unfair. That goes for any business, be it a hair salon, take away, dental surgery or hotel. Try local resolution first please.
To the posters who have said just sack the receptionist, believe me, I wish it was that easy. You have to go through proper channels, verbal warnings, written warnings, appraisals, performance reviews and extra training before you can even consider a move like that. We've been hard hit as an industry due to Covid restrictions, and recruitment has been tough. Not easy to get staff.
All ( correctly) documented complaints can certainly go so far as to be included in documented evidence as to why an employee is underperforming.
Certainly if this case was brought to my attention, I would be doing everything to resolve.