Answers:
No approach, but the phosphoric tart surrounded by nearby will surely put away away at your enamel.
I'd doubt it
The coloring in coke will certainly stain your teeth and be paid them dark not whiter! And its unpromising for the enamel.
No seriously, it is going to reduce your enamel and trademark it easier for you to take cavity. Try Crest Whitestrips.
No and no.brush your teeth or use a whiten product