Will regular toothpaste (not whitening toothpaste) whiten teeth?

No: Neither will whitening toothpaste for that matter. All whitening toothpastes do is remove external staining by virtue of using larger abrasives in the paste. They do not change the color of your teeth.

If filmy stain: No. Regular tooth paste does not have any whitening ingredients--or ineffective amount, if any, to work within 2-minute brushing time. Because of this, it is not going to whiten your teeth. If your teeth tend to be covered with external stains, however, meticulous brushing with tooth paste can remove the stain, thus your teeth can show their whiteness that is uncovered by the paste and brushing.

Not much: Using regular toothpaste will help to keep your teeth clean and healthy, but it does not have any white miners in it so it will not lighten your teeth. It can help to maintain your teeth once you have them where you are happy the them.

No : Toothpaste is used mainly to prevent cavities/gingivitis or reduce tooth sensitivity. Regular toothpaste will not whiten teeth and neither will whitening toothpaste. Whitening toothpaste is usually more abrasive and will remove surface stains on the outside of the tooth, but is not absorbed into the tooth to actually whiten your teeth. In other words, it may clean the teeth but not whiten.