It's better if u get it removed it may become an emergency at some time yes both cleaning n removal can b done on same day but may become very tiring better avoided after anaesthetic no pain n it settles in couple of days eat well before. Going for surgery n don't b scared
17 to 21 years is the age where you wisdom teeth erupts. So its common to have slight pain or discomfort associated with teething (eruption of teeth)
if it is wisdom teeth pain, you can wait and see for few days so that pain subsides by itself, mean while you can take a course of pain killers for few days. If the pain does not subside or the pain is from the other teeth you can get a OPG (full mouth x-ray) done and consult a dentist at the earliest.
This is known as supernumerary.
Single excess tooth is relatively common, multiple hyperdontia is rare
Can happen due to environmental or genetic factors or a number of disorders, including Gardner's syndrome or cleidocranial dysostosis.
No problem if you don't have any symptoms like pain ,gums swelling.
If you have any trouble once consult a dentist he can identify after examination.