Front surface of tooth broke to gum line. What do I do?

Hello,

Two days ago, a tooth that I have had a root canal done on broke. The front surface snapped all the way to the gum line, and is only attached to the gum in a small spot. It still fits perfectly onto the surface it broke from, but pulls out at the slightest pressure, which hurts my gum, because it's still attached there. I have an appointment tomorrow, but I'm just wondering if keeping the tooth surface attached is necessary. Is it helping any, or will the dentist just pull it off anyway? Eating has been quite difficult, and if keeping the tooth surface attached to my skin isn't going to save it anyway, I'd rather just pull it off myself. Any advice would be much appreciated.