What do you income for line dental insurance?

My husband's company wants to charge us $21/week for dental insurance. I would assume they are charging us 100% of the premium. It only covers $1000 per year. How can a dental insurance company charge over the amount that they cover. $21 per week would cost $1092 per year. I'm merely really pissed off right now. I thought it be a mistake at first, but turns out it's not.
Answers:
it might be that the deductible is $1000? Saying you have to pay that amount earlier the insurance pays 100% of the total.

edit: You can run a free dental quote here to get an impression
http://medical-ins.com/
okay we pay $120 a month that is with the sole purpose for my husband and me, but it covers 90% and that includes whitening treatments, crowns, bridges and everything else, our deductible is $500
That's $1,000 PER PERSON. Plus you get the network discounts for the dentists surrounded by the plan on top of that. $80/month is pretty cheap...$110-$130 is what a plan would usually run (depending on your state/zip code). They're likely contributing any not at all or very little. If it's 100/80/50 (preventative/basic/major) consequently that's normal as well.
I pay about $46 per month for my daughter and myself.


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