You bite into a piece of toast and something shoots through a back tooth. Sharp, fast, gone before you can point to it. The rest of the day is fine. Then dinner comes and it happens again.
That on-again, off-again pain is one of the most common complaints a dentist in Garner, NC hears, and it usually points to a cracked tooth rather than a cavity. Cavities build a dull ache that hangs around. Cracks stab and disappear. The distinction matters because a crack that only bothers you under pressure is still growing every single time you use that tooth.
Why does a cracked tooth only hurt when I bite down?
A cracked molar hurts on chewing because biting pressure flexes the two segments of the tooth slightly apart, and that tiny movement irritates the living pulp inside. Release the pressure and the segments settle back together. The nerve calms down. Pain stops.
That is also why the sting often comes on release rather than on the bite itself. You chew, the halves separate, then they snap back and the nerve reacts.
Molars take the worst of it. The back teeth handle somewhere around 200 pounds of force per square inch during normal chewing, and far more if you clench at night. A hairline fracture in a front tooth might sit quiet for years. The same fracture in a lower second molar gets worked on a thousand times a day.
How can you tell a cracked tooth from a cavity?
Cavities and cracks announce themselves differently. A cavity that has reached the point of hurting tends to react to cold and sugar, and the ache lingers for a while after the trigger is gone. A crack reacts to pressure and releases fast.
Some other signals worth paying attention to:
- The pain moves around. You can tell it is the lower right, but not which tooth.
- It only happens on certain foods. Steak, ice, hard candy, bagels.
- Cold water hits it, but warm coffee does not.
- Nothing shows up on the surface when you look in the mirror.
That last one throws people off constantly. Cracks in enamel are often invisible without transillumination or a bite stick test. An X-ray frequently misses them too, because a vertical fracture running the same direction as the beam barely registers on film.
What happens if you ignore a cracked molar?
Ignoring it lets the crack travel, and where it ends up determines how expensive the fix gets. This is the part people underestimate.
A crack confined to enamel is cosmetic. A crack that reaches the dentin becomes sensitive. Once it reaches the pulp chamber, the nerve gets infected and you are looking at root canal therapy. If it runs past the gumline and splits the root, that tooth usually cannot be saved at all.
The whole path can take two years. It can also take two weeks. Nobody can tell you which, and that uncertainty is the actual argument for getting it looked at while it is still a nuisance instead of a crisis.
Cost tracks that same line. A bonded filling or an onlay on an early crack runs a few hundred dollars. Root canal plus crown lands in four figures. An extraction followed by an implant is more than that, plus months of healing.
Is a cracked tooth a reason to see an emergency dentist near me?
A cracked tooth becomes an emergency when the pain stops being occasional and starts being constant, when the tooth throbs on its own without you touching it, or when a piece actually breaks off and leaves a sharp edge. Swelling in the gum or cheek around that tooth means infection, and that needs same-day attention.
Intermittent chewing pain with no swelling does not require a middle-of-the-night call. It does require an appointment in the next week or two. Waiting three months to see whether it gets better is how a filling turns into a root canal.
If you crack a tooth on a weekend and it is bearable, rinse with warm salt water, chew on the other side, skip anything hard or sticky, and get in as soon as the office opens.
How do dentists fix a cracked molar?
Treatment depends on how deep the crack runs, and finding that out comes first. A bite stick test isolates which cusp is moving. A dental microscope or dye can reveal the fracture line. Sometimes the crack only becomes fully visible after an old filling comes out.
For shallow cracks, bonding or an onlay seals the fracture and stops the flexing. For deeper cracks that have not reached the nerve, a full crown wraps the tooth and holds the segments together, which is usually the difference between keeping the tooth and losing it. If the pulp is already involved, root canal treatment cleans out the infected tissue and a crown goes on top.
Large old silver fillings are a common culprit, by the way. Those fillings expand and contract with temperature and can wedge a tooth apart over decades. If you have several of them and one tooth has started talking to you, that is a reasonable place to start looking.
Grinding is the other big one. If you wake up with a tight jaw or your partner mentions the noise, a night guard protects whatever repair you get from cracking again.
Chewing pain that comes and goes is your tooth telling you something is loose in there. It will not tighten back up on its own.
If a back tooth has been catching you off guard, schedule a visit with New Hope Dental Care and we can find out which tooth it is and how far it has gone.