Have you tried switching to diet sodas?

My wife had an eating disorder from her teens to her thirties. To get a feeling of being full she would drink diet sodas. It’s a habit she still keeps even though she’s able to eat less restrictively these days.

People with EDs generally don’t have great teeth so she’s always been super paranoid about hers. Her dentist said to counter the acid she should drink with a straw and finish it in one go then wash her mouth with water.

Probably not helpful but just incase