I see!! LOL
It is very expensive! You can still look into getting added to your moms insurance? If you have double coverage thats the best!
I had double coverage last year and I had dental work done and between the 2 companies everything was covered.
If thats not an option, another idea is trying another dentist who may take payments? I know it sounds funny but maybe you can shop around.
I recently got braces on my lower teeth and I was quoted 4700 from one orthodontist and thought thats what I was gonna have to pay. But a friend of mine suggested I shop around so I went to another ortho, and he said 3500, then I went to another and she said 2500!

AND the 1st 2 orthos wanted 1/2 down and monthly payments there after but this last ortho told me to pay what I could afford as the down (she said even $50 was OK) and she will stretch the rest out in monthly payments.
I got the braces and all the dental work done in May and paid it all off with my tax return. It was great being able to pay it all off and take care of everything but I am sure my hubby and kids would of much rather gone to disneyland or somewhere fun with the money. Oh well