For a small dent I would try drilling a small hole on the back side in order to get a tool like a punch in direct contact with the dented area and try working the dent out with just hand pressure pressing against the dent. If that didn't work I would try light hammer taps. Once the dented surface has been raised flush you can file, sand and finally polish the stainless to look like new. Then fill the hole on the back side and repaint it.