Why can't we use straws or chew gum?

My dr. office said to NOT use straws to drink or chew gum. My breath, as I lose weight, NEEDS gum and sometimes it would just help to have that going on in my mouth to ward off the munchies. And about STRAWS, I'm having the worst time getting all my liquids and believe it or not, it seems easier to get them in when I use a straw. Just curious on what YOUR dr. says on this.

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