不吃東西只吊葡萄糖水的人會否蛀牙?

1. Yes.

2. Saliva is usually acidic. Without certain nutrition (like Vitamin, proteins, etc.), your teeth will not be able to stay strong against your own saliva.

It is also why one of the symptoms for eating disorder is to check the teeth.

吊葡萄糖水直注血管，不入口，你可能未試過，有機會試試。