I basically just want to know what DNC's are generally used for. Like are there other things that it can be used for other then miscarrgies? So if anyone can answer that for me that would be great!;)

First, you need to get you acronyms right. D & C = Dialation and curretage or Dilate and scrape

They can be used after birth if pieces of placenta are left behind. My sister had to go back a week after giving birth because there was a teenie tiny piece of placenta that was left, and you can bleed to death if all of it doesn't get removed. D & C has also been used as a nice way to say abort.

A D&C is often used for the following conditions:

Irregular bleeding: You may experience irregular bleeding from time to time, including spotting between periods. If the spotting develops into continuous midcycle bleeding, your health care provider may perform a D&C to investigate the cause of bleeding.

Too much bleeding: Bleeding with long, heavy periods, or bleeding after menopause, can signal a number of problems. These symptoms may not need immediate investigation. You may observe and record them. At some point, though, your doctor may look for a cause that is best detected with a hysteroscopy.

Fibroids and polyps: These conditions are very common. In fact, they are thought to occur in about 20% of all women. Fibroid tumors are noncancerous growths appearing in and on the uterus. Some even grow out from the uterine wall on a stalk. Fibroids can cause chronic pain and heavy bleeding. Polyps, like fibroids, are noncancerous growths and are a common cause of irregular bleeding. Polyps and fibroids can have symptoms that resemble other more serious causes of bleeding. Your doctor may still want to perform a hysteroscopy.

Endometrial cancer: Cancer is a scary word, especially when it is said about you. A D&C and hysteroscopy are often performed to make certain your symptoms are not caused by uterine cancer. It is, of course, important to detect cancer in its earliest, most curable stages.

Therapeutic D&C: A D&C is often planned as treatment when the source of the problem is already known. One situation is an incomplete miscarriage or even full-term delivery when, for some reason, the uterus has not pushed out all the fetal or placental tissue inside of it. If tissue is left behind, excess bleeding can result, perhaps even life–threatening bleeding. This is an important reason why your doctor will want to remove any remaining tissue with a D&C.

From here: Dilation and Curettage (D&C)

There's also a wiki article:
Dilation and curettage - Wikipedia, the free encyclopedia