If it is fresh squeezed it should be pasteurized or bolied and then diluted with a small dosage of water (1 oz for every 12 oz) if it is store bought then it can be drank without any editing unless...
Yes, because if you do it immediately the bristles will brush away the enamel left weakened by the acids in our food. Floss and rinse with water as soon as possible, but wait before brushing.