With my medical insurance, as a family we have a small deductible of $250 dollars after which I am responsible for a copay with every doctors visit or procedure. There is a maximum to the coverage but its a very high number, in fact I had gallbladder surgery two years ago where insurance laid out over $20k and I spent about $100 out of pocket.
Dental insurance? Not so simple. In fact, unless you're a dentist it's very difficult to figure out what you pay for every visit. There's this whole schedule of fees which tells you what they pay for any given procedure and what you are responsible for. The problem is they don't always use the same language as the dentist and the dentist doesn't always agree with their fee! So I usually ask the dentist to check with my insurance and give me a price. Once I get the price from the dentist, I decide whether I can afford to do this now or of I should wait. BIG MISTAKE.