Before diving into the cause and prevention of your "rough teeth," we should break down what feels rough when you touch it with your tongue. More than likely, that's your enamel, the outer layer of your teeth. It's the hardest substance in your body and acts as a shield against any germs or harm that could attack your teeth. While it is tough and strong, it still has vulnerabilities that can lead to erosion. When your enamel and teeth erode (usually from acid), it leaves your tooth not as smooth as it normal. Fortunately, you're able to address and treat the erosion, so your enamel is as healthy as possible. And then your teeth won't feel so rough.