A curettage is a gynecological procedure whose purpose is to scrape the inner lining of the uterus, i.e. the endometrium. Thus, curettage removes this mucous layer, but it will regenerate again as it does in each menstrual cycle of the woman.
The curettage procedure is quite simple and usually takes about 15 minutes. However, it is performed under local or general anesthesia (depending on the particular situation), so that the woman does not feel any pain.