Are ecig aka electronic cigarettes bad for your teeth and gums?

Yes: They still give you nicotine which has been proven harmful to oral health. OTOH, you get exposed less to other noxious ingredients in conventional cigarette smoke. This hasn't been well studied but my take is that they are bad but perhaps less bad than cigarettes. Of course this depends on the frequency and type of liquid nicotine you use. By far best to avoid nicotine altogether.

Yes, e-cig: electronic cigarettes still pose health risks to your teeth, gums and body.