I think it's the acid in the lemons. I had to really water down my lemonade so my teeth wouldn't feel it as much but then I wasn't getting the benefits of the juice. And, Nat.....yea, it's like I can't stop eating. People said my stomach would shrink but I can sure fit alot of food in there. It's not like I was doing the cleanse to lose weight but I wasn't planning on gaining any either. I try to make smart eating choices but instead of eating a few peanuts I polish off the bag...then I feel sick...but then I go get lunch....LOLOLOLOLOL This healthy thing is not as easy as it should be!