Take a deep breathe ! What you're experiencing is perfectly normal. Ever notice your weight goes up during TOM ? Most women tend to "gain" weight during their menstrual cycle. Is that a fat gain ? Nope. it's nothing more than a temporary water weight gain that passes in a few days.
There are many different reasons your weight could go up that have nothing to do with how many calories you eat. retaining water is the most likely cause of a person gaining weight. I can easily gain or lose as much as 3-4 pounds in a day because of a shift in my water weight.
Don't believe water has weight ? I can prove it. Weigh yourself first thing in the morning before you go pee. Then do your business and get back on the scale. Did you lose weight ? Yes. Did you lose fat ? Nope. Water has weight. The food you eat has weight. So, if you don't have a bowel movement in the morning, all the food you ate from the day before is still in your intestines. Your waste products (poop) have weight. So, don't do a poop in the morning and that could be a 1-2 pound "gain" from the day before.
Remember, there is more to good health than a number that stares at us from between our toes in the morning.
Take care of your tooth !! Don't worry !!