I was thinking the same thing!
I'd seriously feel like my privacy was violated. She may have had good intentions & it may be completely innocent, but I'd still bothered that she looked up my personal info & called me at home. At the very least it is unprofessional.
I certainly wouldn't call the dentist because I wouldn't want her to lose her job. If it happened again, I'd definitely talk to her about it.
I agree with the bolded part. They call to remind me of an appointment so I guess looking up my phone number which is in the book isn't a huge deal.