I drink tea with a metal straw, otherwise, I press my tongue to the bottom of the glass and avoid contact that way. I've started brushing teeth with baking soda, very innocous and low foaming stuff, otherwise just use a small amount of some natural toothpaste (SLS free) so you can avoid the foam getting on your lips and turning everything white. Don't forget to moisturize before going to sleep too. The hardest part is knowing when to exfoliate the dead skin. Use your intutition, if it hurts or bleeds, it's too early. If it starts to stink and have colored goo over it, it's way too late.