After a cavity filling, the biggest mistake you can make is eating before the numbness wears off, which typically takes one to three hours. Beyond that, several common behaviors can damage a fresh filling, increase sensitivity, or slow your recovery. What you need to avoid depends partly on the type of filling you received and how extensive the work was.
Don’t Eat While Your Mouth Is Numb
This is the most important rule regardless of filling type. Local anesthesia removes your ability to feel pain, pressure, and temperature, which means you can bite through your cheek or tongue without realizing it. You also can’t gauge how hot food or drinks are, raising the risk of burns to soft tissue you won’t feel until the numbness fades.
Most people regain full sensation within one to three hours. Wait until you can feel your lips, tongue, and the inside of your cheek before eating anything.
Eating Restrictions by Filling Type
Composite (tooth-colored) fillings harden instantly under the UV curing light your dentist uses during the procedure. Once the numbness is gone, you can chew on that side of your mouth. Amalgam (silver) fillings are different: they take a full 24 hours to reach maximum strength. During that window, chew only on the opposite side.
For the first two days after either type of filling, avoid these food categories:
- Hard or crunchy foods like nuts, popcorn, chips, raw carrots, and hard candy. These can crack or dislodge a new filling.
- Sticky or chewy foods like caramel, gum, gummy candy, and toffee. These can pull on the filling and trap sugar against the tooth.
- Very hot or very cold items like ice cream, hot coffee, and steaming soup. Temperature extremes trigger sharp sensitivity in a freshly filled tooth.
- Tough meats and crusty bread that require heavy chewing, which can leave the tooth sore.
- Alcohol and carbonated drinks that can irritate the tooth and surrounding tissue.
Coffee, tea, red wine, berries, tomato sauce, and soy sauce can also stain a composite filling before it fully sets. If you care about color matching, limit these for the first day or two.
Don’t Skip Brushing, but Be Gentle
Some people avoid brushing or flossing near a new filling out of fear they’ll damage it. That’s a mistake. Bacteria and food debris around a fresh filling are exactly what caused the cavity in the first place. Brush twice daily with fluoride toothpaste, including around the filled tooth.
For composite fillings, you can floss the same day once numbness wears off. For amalgam fillings, some dentists recommend waiting until the next day before flossing aggressively around the restoration. In either case, don’t stop flossing entirely. Just use a gentle touch and slide the floss carefully rather than snapping it between your teeth.
Hold Off on Intense Exercise
A filling isn’t surgery, but jumping straight into a hard workout can make your recovery less comfortable. Vigorous exercise increases blood flow throughout your body, including to the treated tooth, which can cause throbbing or heightened sensitivity. Heavy lifting is a particular concern because people tend to clench their jaw under strain, putting direct pressure on the new filling.
For small composite fillings, light activity is fine the same day once you feel comfortable. For amalgam fillings, large fillings, or procedures where multiple teeth were treated, wait at least 24 hours before intense exercise. A good general rule: wait at least four to six hours before even light workouts, and make sure the anesthesia has fully worn off first. Exercising with a numb mouth raises the risk of biting your cheek or tongue without noticing.
Don’t Chew Ice or Use Teeth as Tools
If you normally chew ice, tear open packaging with your teeth, or bite your nails, a new filling is the time to break those habits. These behaviors place excessive force on the restoration and can crack or dislodge it. A filling that comes loose exposes the tooth to bacteria and new decay, potentially requiring a larger restoration or even a crown.
If you grind or clench your teeth at night (a condition called bruxism), mention it to your dentist. Nighttime grinding puts repeated force on fillings and can shorten their lifespan significantly. A night guard can protect both the new filling and your other teeth.
What Sensitivity to Expect (and What’s Not Normal)
Some discomfort after a filling is completely normal. The first two days are typically the worst. Drilling, vibration, and heat generated during the procedure create temporary inflammation in the tooth’s inner tissue, and it takes time for that to calm down. Most shallow to moderate fillings feel fully normal within two weeks. Deep fillings that came close to the nerve may take three to four weeks.
Composite fillings sometimes cause more initial sensitivity than amalgam because the material contracts slightly as it hardens, creating microscopic stress within the tooth. Amalgam fillings, on the other hand, conduct temperature more readily than natural tooth structure, so you may notice brief sharp sensations with hot or cold drinks that improve as the tooth adapts.
If you have mild soreness, over-the-counter ibuprofen and acetaminophen taken together work well for dental pain. Research from Harvard Health found this combination outperformed even prescription opioids for dental procedures, with fewer side effects and better sleep.
What isn’t normal: pain that gets worse instead of better after a few days, a sharp sting every time your top and bottom teeth touch, or a persistent feeling that your bite is “off.” These are signs the filling may be sitting too high and hitting the opposing tooth before the rest of your bite connects. This is a quick fix at your dentist’s office, where they’ll shave the filling down slightly. Left alone, a high filling can cause ongoing pain, cheek biting, and difficulty chewing.
Don’t Ignore a Loose or Cracked Filling
If you feel a piece of the filling chip off, notice a rough edge with your tongue, or experience a sudden return of sensitivity weeks or months later, the filling may be compromised. A damaged filling lets bacteria reach the tooth underneath, which can lead to decay forming beneath the restoration. This kind of hidden decay often requires more extensive treatment than the original cavity did. Getting it checked early keeps the fix simple.