How Do Dentists Fix Cavity On Side Of Tooth?

Quick Fix: Spot a hole or dark spot on the side of a tooth? Don’t wait—see your dentist ASAP. Early cavities can sometimes be reversed with fluoride, but deeper ones? They’ll need a filling to stop the decay in its tracks.

What's Happening

Left alone, that decay keeps chewing through the enamel, then the dentin, and finally the pulp. The result? Pain, infection, or even losing the tooth. Side cavities (proximal cavities) are super common because plaque loves to hide in those tight spaces between teeth. Notice a hole, dark spot, or sudden sensitivity on the side of a tooth? Yeah, that’s almost certainly a cavity needing a dentist’s attention.

Step-by-Step Solution

1. Numbing the area: Your dentist will freeze the gums near the troubled tooth—usually with 2% lidocaine plus epinephrine. Give it 2–3 minutes to fully kick in.
2. Isolating the tooth: They’ll drape a rubber dam (latex or non-latex) over the tooth to keep it dry and stop any debris from dropping into your mouth.
3. Removing decay: Next comes the drill—high-speed handpiece (think 400,000 RPM) with a diamond or carbide bur. Shallow cavities get fine burs; deeper ones need larger bores to clear out all the rot.
4. Cleaning the cavity: A slow-speed handpiece with a polishing bur or an air-abrasion unit (aluminum oxide particles) scrubs out leftover decay and roughens the enamel so the filling sticks better.
5. Prepping for the filling: If the cavity’s deep, they might slap in a cavity liner (calcium hydroxide or glass ionomer) to shield the pulp. For composite fillings, they’ll etch the enamel with 35–37% phosphoric acid for 15 seconds, then rinse and dry.
6. Placing the filling:
   • Composite resin: The dentist layers the resin into the cavity, hitting each layer with a blue LED light (450–490 nm) for 20 seconds. They sculpt and polish it until it blends seamlessly with your tooth.
   • Amalgam: This silver-colored mix (mercury, silver, tin, copper) gets packed into the cavity, shaped, and sets in minutes—though it takes a full day to harden completely.
   • Gold or porcelain: These custom inlays/onlays are made in a lab and cemented in during a second visit.
7. Final check: They’ll test your bite with articulating paper and tweak the filling if needed. A follow-up in 1–2 weeks is often suggested to make sure nothing’s sensitive.

If This Didn’t Work

• Re-evaluate the filling: Book an appointment within 48 hours. They’ll check for leaks, hidden decay under the filling, or a poor seal. Might need a new filling—or if the cavity was huge, a crown could be the answer.
• Root canal therapy: When decay hits the pulp and you’re dealing with throbbing agony, a root canal cleans out the infected pulp, disinfects the canals, and seals them with gutta-percha.
• Tooth extraction: In the worst cases—when the tooth is beyond saving—extraction may be the only option. Afterward, you can talk replacements like implants or bridges.

Prevention Tips

• Floss daily: Waxed floss or a water flosser works best for cleaning between teeth—the spot where 40% of cavities begin American Dental Association.
• Use fluoride toothpaste: Brush twice a day with fluoride toothpaste (1,450 ppm) to help reverse early decay. If you’re high-risk, add a fluoride mouthwash to the routine.
• Limit acidic/sugary foods: Bacteria throw a feast on sugar and then belch out acid that eats enamel. Rinse with water after acidic drinks (soda, citrus) to bring your mouth’s pH back to neutral.
• Get sealants: Dental sealants—thin plastic coatings—are usually applied to molars’ chewing surfaces, though they’re not typically used for side cavities (as of 2026).
• Regular checkups: See your dentist every six months for cleanings and X-rays. Catch cavities early, and fluoride varnish or silver diamine fluoride (SDF) might even reverse them before they become fillings.