How To Write A Cover Letter For Dental Hygiene Cover Letter For A Dental Job With No Advertisement.?

Cover letter for a dental job with no advertisement.? - how to write a cover letter for dental hygiene

I've just changed my training for dental assistants and I am looking for a job. My teacher told us that most dentists do not announce further job and our best bet to make the curriculum at many places as possible.

My problem is to write in my letter. I have never turned in my resume for a job until I find a list ... and I know that in the first paragraph you have to say, how you heard about the opening.

I looked at elsewhere online counseling, but found no help. How can I in a letter for a job without advertising? What do I need to replace "I have your ad for blah blah blah"?