In fact, as long as you drink water on an empty stomach (before breakfast), one cup is not enough, and three cups are better, not hot water, but warm water! Agree to go upstairs and brush your teeth with warm water. This is a good way to protect your teeth, and you can rinse your mouth with warm water after every meal. It's also good for your teeth. Stick to it and form a habit. You'll know its benefits when you get old! Appreciate you drinking water to lose weight! It would be better to add some exercise. I wish you success!