My teenage daughter often gets pale and listless during her periods, which can be quite heavy. She's a picky eater and has a plain diet. Are there particular foods she should focus on?

"Mouth ulcers, known as aphthous ulcers, are shallow with a pink-red or yellowish centre and are usually round or oval - they can be commonly caused by irritation due to poor dental hygiene, smoking, and continuous friction such as sucking lollipops."