Sorry to break the bad news, but wine’s acidity is not great for your teeth. How to protect them? Intersperse your imbibing with sips of water every so often, which helps restore the pH balance in your mouth. And, avoid brushing your teeth until at least 30 minutes have passed after your last sip. If you brush too soon, you’re essentially scrubbing the acid into your teeth, increasing erosion of enamel. Just drink some more water, and wait 30 minutes.