My Crown Fell Off and the Tooth Underneath Is Black

Why a Tooth Turns Black Under a Crown

Crowns get placed for a few different reasons, and most of them involve a tooth that already had significant work done — often a root canal before the crown ever went on. Once a tooth's nerve is gone, or dying, the tooth stops getting the blood supply that keeps it looking like a living tooth, and it darkens from the inside out. A crown hides this completely, which is exactly why people are so startled when one comes off after years and reveals a tooth that looks nothing like they remember.

• A dead nerve (non-vital tooth). The most common cause. The tooth is structurally fine in many cases, just discoloured.
• Old decay under the crown margin. If the edge of the crown wasn't sealing well, decay can spread underneath it for a long time without the person feeling anything.
• Old amalgam or metal staining. Older fillings and posts can leach a grey-black stain into the tooth structure itself.
• A cracked or dying tooth from trauma further back, even one you don't remember clearly.

Is This an Emergency, or Can It Wait a Day or Two?

In most cases, a black tooth on its own is not an emergency — it's a cosmetic and structural finding that needs an appointment, not a hospital visit. What changes that is what's happening around it, not the colour itself.

• Go straight to urgent care: swelling in the face or under the jaw, fever, or a taste of pus.
• Book within a day or two: the tooth is black but there's no pain, no swelling, and no smell.
• Can wait for a routine slot: the crown came off cleanly, the tooth underneath is intact and just discoloured, and nothing hurts.

Either way, don't leave the tooth uncovered for weeks. An exposed tooth — dark or not — is more prone to fracturing under normal biting force, and that turns a straightforward recementing into a rebuild.

What to Do Right Now

• Rinse the crown and the tooth gently with warm water. Don't scrub either one.
• If the crown looks intact and the fit feels obviously right, you can reseat it temporarily with a pharmacy dental cement (not superglue) just to protect the tooth until you're seen — but don't force it if it doesn't sit flush.
• Keep the crown safe in a small container rather than a pocket or tissue, where it's easy to lose or crush.
• Chew on the other side until it's checked.
• Skip the whitening strips and the baking soda paste. Neither touches this kind of internal staining, and both can irritate the exposed tooth.

If This Happens on a Friday Afternoon in Beit Shemesh

Crowns have a habit of coming off mid-bite, on chicken bones and toffee, and Erev Shabbat dinner produces more of both than any other night of the week. Our hours are Sunday to Thursday 8:00 AM to 8:00 PM and Friday 9:00 AM to 5:00 PM, and Shabbat itself is reserved for genuine emergencies only. A black, painless tooth under a fallen crown almost never needs to interrupt Shabbat — protect it as above and call first thing Sunday. Swelling or real pain is a different story, and that's exactly what the after-hours line is for.

Why a Reddit Photo Can't Tell You What's Actually Going On

Search enough dental subreddits and you'll find every possible verdict attached to a photo that looks a lot like yours — dying nerve, cracked root, "nothing to worry about," "see someone today." A phone photo can't tell the difference between a stable, long-dead tooth and one with a crack running toward the root, and a stranger online has no X-ray. What actually decides the plan is a look at the tooth, a check of the crown margin, and usually an X-ray to see what's happening below the gumline — five minutes in a chair does more than an hour of scrolling.

If your crown has fallen off and the tooth underneath is black, call or WhatsApp 055-985-8845. We're on Harav Kook 28/1 in Beit Shemesh, we treat in English and Hebrew, and same-day appointments are usually possible. Our dental crown page has more on how crowns are fitted and refitted, and our page on root canals and crowns covers how the two usually go together.

For background from sources with nothing to sell, the ADA's MouthHealthy explains what dental crowns are for, and the American Association of Endodontists covers what happens to a tooth after root canal treatment.