Confusion about dental insurance comparison?

Ferlinda Asked:

I just started working but they don't offer dental insurance. I found online (through Progressive) a dental insurance comparison site. I found one that I really thought fit me. I'm going to need oral surgery in the near future and this plan, or so I thought, fit me well.

The whole co-insurance thing confuses me. I thought I knew what it meant but their little online "help" chat made my mind boggle. Here is what the website says:

Oral Surgery90% Coinsurance after deductible through Jan. 1 following the effective cheap Acomplia date, 75% Coinsurance after deductible for the next 12 months, 50% Coinsurance after deductible thereafter.
6-month elimination period

So I take that as, if I have a bill of $1000, I would only pay $100. But the online chat told me 90% is what I pay. Is that right? Why would I want to pay that much a month and still have to fork out 90%. Totally confused here! Any insight?

Reply:

my family have this health insurance. It is affordable and has good coverage for dental issues.