Does anyone know of an appropriate lens to take dental photos using NIKON D3000?

I have an 18-55mm zoom with it. I've discovered on many forums that the macro lens is ideal to shoot dental photos but I can't afford to buy a costly lens A lens with a value of 300 dollars should suffice.

Are there any decent images I can take with the standard lens that comes with it, or is it an absolute requirement to purchase the lens that is macro?
dmd vs dds