I am right behind you. Just starting my 3rd day and feeling great.
I read your last post and meant to reply earlier. May I suggest TheraBreath oxygenating toothpaste and mouthwash from Dr. Katz. You can buy it at CVS or Walgreens. It kills odor causing and plaque building bacteria....it's awesome!!! I have given up on regular toothpaste a long time ago. It comes especially handy with the MC, because of the breath issue. Use this and no bad breath or funky taste in your mouth....no kidding.
On the orange juice question I can't give any input, since this is my first MC.