The book has two ways to break the fast. Either through raw foods or through the soup. I would follow the instructions to stay safe.
As far as Sugar on the teeth and brushing...I use Toms of Maine toothpaste. It's all natural and did not have a problem with it triggering digestion.
I don't know what medium grade syrup is. I went to the health food store to get my syrup. We have a Whole Foods here, and they have a store brank Organic B Grade syrup that tastes really good.
I also don't think there's a problem with the tea you are choosing My Smooth Move tea has senna root in it. :)