Amy L

I love seeing the dentist. I was wondering how to address the dental assitants and the hygenist. I know their first names but sees too imformal. Is it okay to call the hygenist "doctor" or is that incorrect. And for dental assitants? There are several when I go and can't usually say "hi" because my mouth is being worked on but I would like to thank them but don't know what's the proper adress.

Please serious answers only. Thanks!