Plans are generally not necessary to get a permit to do mechanical work on a dwelling. You will be expected to briefly describe the work proposed. For example, describe the appliance you intend to install and whether you will be installing a new vent, new ductwork, etc.
It depends on what kind of stitches the dentist used in your mouth. There are two types: stitches that resorb on their own and you don't need to do anything, and the other are stitches for which you see the dentist in about two weeks and he/she removes them. Ask your dentist which type he/she placed in your mouth.
Re: Wisdom teeth stitches still in after 11 days let me see if i can help. When I had my extractions done .. the stitches were there for quite some time .. some of the dissolvable ones hung around for close to 2 weeks .. It is normal and nothing to worry about ..