I have a small white bump in my mouth and its painless is it bad it's on my cheek

Probably not: But white bumps deserve examination as may be precursor to problems. So make arrangements for your Dentist to see you and your bump ASAP.

Suspicious Bump: I would advise you to have the white bump on your cheek examined by a dentist or dental specialist (e.g. oral surgeon, OFP). Any suspicious bump that does not resolve itself in two-three weeks should be evaluated.