A curette is a spoon-shaped or loop-shaped instrument designed to scrape tissue from a surface. It’s used across several medical fields, from dentistry to dermatology to gynecology, and while the basic motion is similar (a controlled scraping stroke), the technique varies depending on where and why it’s being used. Here’s how curettes work in each context.
Dental Curettes: The Most Common Type
In dentistry, curettes are primarily used to remove calculus (hardite deposits) from tooth surfaces, especially below the gumline. The technique relies on a precise blade angle: the cutting edge should meet the tooth surface at 70 to 80 degrees. Too steep and you’ll gouge the root. Too shallow and the blade slides over the deposit without removing it.
Once positioned, you apply lateral pressure against the tooth and pull the curette using vertical, diagonal, or horizontal strokes. These are called “working strokes,” and the direction depends on where the deposit sits. The instrument should stay in contact with the tooth throughout the stroke, moving from the base of the pocket toward the crown.
Choosing the Right Dental Curette
There are two main categories. Universal curettes, like the Columbia 4R/4L, have a straight shank and two cutting edges, so they can be used in multiple areas of the mouth. Gracey curettes are area-specific: each one is designed with a particular curve to reach a specific region. A Gracey 1/2, for example, is shaped for front teeth, while a Gracey 13/14 has a more aggressive curve to access the back molars below the gumline. Many clinicians keep both types on hand, using universal curettes for general work and Gracey curettes when they need to reach tricky spots.
Skin Curettage: Scraping Surface Lesions
Dermal curettes look different from dental ones. They’re typically small, round-looped instruments used to scrape or scoop out skin lesions that sit on or near the surface. Common targets include basal cell carcinomas and seborrheic keratoses (those rough, waxy growths that appear with age).
The technique is straightforward: the curette is pressed against the base of the lesion and drawn across it with firm, even pressure. Abnormal tissue is softer than healthy skin, so the curette selectively removes the lesion while the firmer surrounding tissue resists scraping. This difference in texture is what guides the procedure. In many cases, curettage is paired with electrodesiccation, where a high-frequency electrical current is applied to the scraped area before or after to destroy remaining abnormal cells and control bleeding. The cycle of scraping and cauterizing may be repeated two or three times in a single session.
This approach works best for superficial lesions that don’t extend deep into the skin. Lesions that penetrate into deeper tissue layers typically require a full surgical excision instead.
Ear Curettes: Removing Impacted Wax
Small plastic or metal loop curettes are one of several tools used to manually extract impacted earwax. The instrument is gently inserted into the ear canal and guided past or behind the wax plug, then pulled outward to drag the wax out.
What makes this tricky is anatomy. The skin lining the ear canal becomes increasingly sensitive the deeper you go, and the eardrum at the end is extremely pain-sensitive to even light contact. There is a real risk of perforation and local trauma, particularly if the patient moves unexpectedly or the person using the curette lacks experience. For this reason, clinicians counsel patients beforehand to stay completely still during the procedure. Ear curettes sold for home use exist, but the margin for error is small, and most are designed to scoop wax from the outer portion of the canal only.
Gynecological Curettes in D&C Procedures
In a dilation and curettage (D&C), a curette is used to remove tissue from the lining of the uterus. After the cervix is gradually dilated, a metal or plastic curette is passed through the cervical canal and advanced to the top of the uterine cavity (the fundus). The curette is then drawn downward along the uterine wall, from the fundus back toward the cervix, while suction may be applied. The clinician rotates the curette a full 360 degrees over repeated passes to cover the entire cavity.
The biological goal depends on the situation. In a patient who isn’t pregnant, the procedure removes the functional layer of the uterine lining, often to diagnose abnormal bleeding or remove polyps. In a pregnant patient, the goal is to remove pregnancy tissue while carefully avoiding damage to the deeper layers of the uterine wall, since scraping too deeply can lead to scar tissue formation inside the uterus.
Keeping a Curette Sharp
A dull curette doesn’t just work poorly; it forces you to apply more pressure, which increases the risk of slipping or damaging surrounding tissue. There are two reliable ways to check sharpness. The first is visual: shine a bright light directly onto the cutting edge. A sharp blade won’t reflect light. If you see a bright line glinting back at you, the edge has rounded over and needs sharpening.
The second method uses a plastic testing stick. Place the curette on the stick at the same angle you’d use on tissue. If the blade doesn’t bite into and shave off a thin layer of plastic with light pressure, it’s dull. In clinical settings, instruments are checked before each use, and sharpening is done with a fine stone at the original bevel angle to restore the edge without changing the blade geometry.
Sterilization Between Uses
Reusable stainless steel curettes are sterilized by autoclaving (steam sterilization). The standard gravity-displacement cycle for wrapped instruments runs 30 minutes at 121°C (250°F) or 15 minutes at 132°C (270°F). Dynamic air-removal autoclaves, which are more efficient at penetrating instrument packs, can achieve sterilization of wrapped instruments in as little as 4 minutes at 132°C. After the sterilization cycle, instruments need an additional drying period, typically 15 to 30 minutes depending on the load type. Disposable curettes, which are increasingly common in dermatology and ear care, skip this step entirely and are discarded after a single use.
Wound Care After Curettage
If you’ve had a skin lesion removed by curettage, the aftercare is simple but matters for healing. Keep the original dressing in place and dry for the first two days. After that, you can shower normally. Remove the wet dressing, gently pat the area clean with a damp cloth (don’t rub), dry it thoroughly by patting, and apply a thin layer of plain petroleum jelly to the wound site twice daily until it has fully healed over.
You can leave the wound uncovered once the initial dressing comes off, but consider a bandage if the area is still oozing slightly, if it’s in a spot prone to getting dirty, or if clothing catches on it. The key principle is keeping the wound clean. For curettage sites on the scalp, pat hair dry rather than using a blow dryer, avoid styling products, and be careful when brushing near the area.