I'm a level 1 Dental Assisting graduate in Ontario. I took a job in assisting after graduating and made $14/hr and I hated it. I felt overworked and underpaid. So I decided to switch to reception. I made $15/hr at my first reception job no schooling experience in that area and less than a year experience doing assisting. I switched offices again and now I get $16/hr.
If you want to get hired as a receptionist, you should go into an office in person and make sure you hand your resume over to the office manager because 9 times out of 10 they are probably going to be the one interviewing you, not the dentist. Also if they aren't busy they may interview you on the spot, so be prepared and look presentable. It doesn't hurt to sit down and write down things you think you will be asked in a job interview beforehand. Make sure you brainstorm answers to the most common interview questions ie: What is your greatest strength/weakness? Explain a situation where you went above and beyond expectation. Where do you expect to be in 5 years? etc. Obviously you don't want to sound too rehearsed, but you need to be prepared.
It is honestly all about making that person like you at first. Be friendly. Be likeable. And if you are offered an opportunity or trial day PAY CLOSE ATTENTION TO DETAIL. The less times you have to be shown how to do something, the more competent you look, and the more confidence they will have in you as a hire.
Also, do some research on cover letter and resume writing. Make sure you don't have too much unnecessary crap on your resume. There should be no spelling or continuity errors.
I hope that helps a little bit. Just doing a little extra preparation before got me hired at the first office I walked into.
And as someone else said before, take the job that only offers you $10/hr. Do it for a little bit then use it as experience. Look at the first time you get hired as a stepping stone to get to where you eventually want to be. Good luck.