Dental Curette: The Complete Clinical Guide

Table of Contents

1. What is a dental curette?

2. Anatomy & design features

3. Types of dental curettes

4. Gracey curette numbering guide

5. Curette vs. scaler: key differences

6. Clinical uses & indications

7. Proper technique

8. Sharpening & maintenance

9. Frequently asked questions

1. What is a dental curette?

A dental curette is a hand-held periodontal instrument engineered for the removal of calculus deposits and the smoothing of root surfaces below the gum line. Unlike most instruments in dentistry, it is designed to reach safely into the gingival sulcus and periodontal pockets, areas that toothbrushes, floss, and even supragingival scalers simply cannot clean.

The curette's defining characteristic is its rounded toe and rounded back, which allows the clinician to navigate deep into pockets without lacerating delicate gum tissue. This distinguishes it fundamentally from sickle scalers, which end in a pointed tip and are restricted to use above the gum line.

Dental curettes are classified as treatment instruments and form the foundation of non-surgical periodontal therapy. They are the instrument of choice for subgingival calculus removal and root surface debridement.

Origin of the Term “Curette” 

The term curette is derived from the French word cureter, meaning “to scrape.” Although curettes are used across several medical fields, including gynaecology in procedures such as dilation and curettage (D&C), the dental curette evolved specifically for the anatomy of teeth, roots, and periodontal pockets. 

Who uses dental curettes? 

Dental curettes are used daily by dental hygienists, periodontists, and general dentists. For dental hygienists in particular, curettes are the most-used hand instrument in clinical practice. Mastering instrument selection, adaptation, and stroke technique forms a core part of dental hygiene education. Patients undergoing scaling and root planing (SRP), periodontal maintenance, or deep cleaning appointments will almost always be treated with curettes.

2. Anatomy & design features

Rounded toe

The blunt, curved tip allows safe subgingival access without puncturing the pocket epithelium.

Rounded back

Prevents the instrument's rear edge from traumatising the gingival wall during strokes.

Cutting edge(s)

Universal curettes have two cutting edges; Gracey curettes have one lower, offset cutting edge.

Blade angle

The face of a Gracey curette is set at 70° to the terminal shank for ideal subgingival angulation.

Shank

The shank connects the blade to the handle and varies in length and angulation per instrument type.

Handle

Ergonomic, weighted handles reduce grip force and wrist fatigue during extended procedures.

3. Types of dental curettes

Dental curettes fall into two primary categories, universal and area-specific, with several specialised subtypes for specific clinical situations.

Universal curettes

A universal curette features two usable cutting edges and can be adapted to all tooth surfaces and all areas of the mouth. Both cutting edges are at a 90° angle to the face of the instrument, allowing either side to be used. They are ideal for general scaling and root planing across the entire dentition and are frequently used by general dentists and hygienists as a workhorse instrument. Common universal curettes include:

• Columbia curettes — broad-bladed, excellent for removing heavy supragingival and subgingival calculus on anterior and posterior teeth

• Barnhart curettes — thinner blade and longer shank for improved posterior access

• McCall curettes — heavier, rigid instruments for tenacious supragingival deposits

• Younger-Good curettes — slimmer, more delicate for enhanced tactile sensitivity and fine scaling

Gracey curettes (area-specific)

Developed by Dr. Clayton H. Gracey at the University of Michigan in the 1940s, Gracey curettes are area-specific instruments. Each instrument is designed to adapt to a precise tooth surface in a precise region of the mouth. The blade is offset at 70° to the terminal shank, creating a single lower cutting edge that is perfectly positioned for subgingival scaling. Because of this design, only one cutting edge is used per instrument, and the terminal shank must be kept parallel to the tooth surface being instrumented.

How to Choose Between Universal and Gracey Curettes

Selecting the right curette comes down to three clinical factors: where you are working in the mouth, the depth of the pocket, and how much calculus you are dealing with.

Universal curettes are the better starting point when performing initial scaling across the full dentition, working supragingivally or in shallow sulci (1–3 mm), or treating a patient with light, generalised deposits. Their dual cutting edges enable rapid adaptation to multiple surfaces without instrument changes, making them efficient for routine preventive appointments and initial debridement.

Gracey curettes become the preferred choice during active periodontal therapy, particularly when pockets exceed 4 mm, root anatomy is narrow or curved, or precise instrumentation of mesial and distal surfaces is required. Their offset blade angle and single cutting edge provide superior tissue adaptation in confined spaces that a universal curette cannot fully reach. 

In clinical practice, most hygienists use both in the same appointment: a universal curette for gross calculus removal across all surfaces, followed by the appropriate Gracey number for fine subgingival debridement in pocketed areas. This combination approach delivers the efficiency of universal instruments with the precision of area-specific design where it matters most.

Specialised curette subtypes

4. Gracey curette numbering guide

There are 9 traditional Gracey curette pairs. Each number corresponds to a specific area and surface of the mouth:

A Practical Note on Gracey Selection

For clinicians building their first Gracey set, a core kit of five pairs, 1/2, 7/8, 11/12, 13/14, and 17/18, covers the majority of clinical situations across the full mouth. The 1/2 handles anterior surfaces, the 7/8 addresses posterior buccal and lingual, the 11/12 and 13/14 manage mesial and distal surfaces of premolars and molars, and the 17/18 reaches the difficult distal of terminal molars, where standard posterior curettes often struggle to adapt effectively.

The 15/16 is worth adding once the 11/12 is mastered. Many hygienists find the 15/16 shank design more ergonomic for mesial surfaces of posterior teeth and report less wrist strain during extended appointments. The 9/10 pair is less commonly included in starter kits but becomes highly valuable in moderate-to-severe periodontal cases requiring deep buccal and lingual molar instrumentation.

5. Curette vs. scaler: key differences

Curette

• Rounded toe and back

• Designed for subgingival use

• Safe inside periodontal pockets

• Used for root planing & debridement

• Semi-circular cross-section

• Lower tissue trauma

Scaler

• Pointed or sharp tip

• Primarily supragingival use

• Can injure sulcular epithelium

• Best for gross calculus removal

• Triangular cross-section

• Higher tip trauma risk subgingivally

6. Clinical uses & indications

Dental curettes are indicated across a broad range of periodontal and preventive scenarios:

• Scaling and root planing (SRP): The primary use. Curettes remove supragingival and subgingival calculus and debride contaminated root surfaces to reduce bacterial biofilm and inflammation.

• Chronic periodontitis management: Comprehensive subgingival debridement is the cornerstone of non-surgical periodontal therapy for active disease.

• Periodontal maintenance therapy: Periodic professional cleaning using curettes for patients with a history of periodontal treatment prevents disease recurrence.

• Preventive care: Targeted cleaning for at-risk patients reduces plaque accumulation before disease onset.

• Implant maintenance: Specialised non-metallic implant curettes remove biofilm around implant surfaces without scratching the titanium.

• Gingival curettage: In some surgical contexts, curettes remove granulation tissue from the pocket wall.

Research confirms that periodontal root debridement with curettes is a key factor in regaining periodontal attachment on previously infected root surfaces — making the curette central to both disease treatment and long-term health maintenance.

7. Proper technique

1. Instrument selection: Choose a universal curette for broad coverage or the correct Gracey number for the specific tooth surface. Confirm the correct working end by ensuring the face tilts toward the tooth (anterior curettes) or the terminal shank is parallel to the tooth surface (posterior curettes).

2. Modified pen grasp: Hold the instrument using a modified pen grasp for maximum tactile sensitivity and controlled pressure. The ring finger serves as the fulcrum for stability.

3. Insertion angle: Insert the curette into the pocket at a near-closed angle (approx. 0°), then open to approximately 45–90° once the base of the pocket is reached to engage the cutting edge on the tooth surface.

4. Stroke direction: Use vertical strokes on anterior teeth and on mesial/distal surfaces of posterior teeth. Use oblique strokes on the facial and lingual surfaces of posterior teeth. Horizontal strokes are used at line angles and mid-surfaces of anteriors.

5. Controlled pressure: Apply firm but controlled lateral pressure. Limit strokes to areas with calculus deposits to minimise muscle fatigue and tissue trauma. The toe third of the blade should remain adapted to the root at all times.

Using the wrong working end of an area-specific Gracey curette can cause tissue trauma. Always verify correct end selection before entering the pocket — the face must tilt toward the tooth, not away from it.

8. Sharpening & maintenance

A dull curette is one of the most common clinical problems in dental hygiene. Dull instruments require more force, cause more tissue trauma, risk burnishing calculus into the root surface, and contribute to hand and wrist fatigue.

How quickly do curettes dull?

Studies show that the cutting edges of curettes can dull after as few as 15 to 40 calculus removal strokes. This means instruments used on multiple patients, or during long appointments, may need sharpening mid-session.

How to assess sharpness

Use a plastic acrylic testing stick. Adapt the cutting edge at 70–80° against the stick. A sharp curette will grab or bite the surface; a dull curette will slide smoothly without catching. Visually, a sharp edge reflects no light — a dull, rounded edge reflects a bright line of light.

Sharpening technique

• Maintain the internal angle of 70–80° between the face and lateral surface

• Sharpen in sections: heel third, middle third, toe third

• For Gracey curettes, sharpen only the lower (working) cutting edge

• Always finish with a downward stroke to prevent metal burring

• Use a cylindrical stone to preserve and maintain the rounded toe

• Wipe sharpened edge with sterile gauze to remove metal shavings

Sterilization and storage

• Thoroughly clean and dry instruments before autoclaving — moisture causes corrosion and blade dulling

• Store in protective cassettes to prevent blade contact and damage

• Implant curettes made of plastic or resin require low-temperature sterilization — not standard autoclave cycles

• Inspect instruments before each patient for chips, corrosion, or distorted blades

9. Frequently asked questions

Are curettes painful to use?

When used correctly, curettes are well-tolerated. The rounded design minimises tissue trauma. Some patients experience mild sensitivity during deep cleaning; local anaesthesia can be used when needed for patient comfort.

How is a Gracey curette different from a universal curette?

A universal curette has two cutting edges and can be used anywhere in the mouth. A Gracey curette has one offset cutting edge and is area-specific — each instrument is designed for particular tooth surfaces. Gracey curettes offer superior access and precision for subgingival work in targeted zones.

How long does a curette last?

With proper sharpening and sterilization, a high-quality stainless steel curette can last several years. Repeated sharpening gradually removes metal from the blade; once the blade becomes too thin, the instrument should be replaced.

Can curettes be used on dental implants?

Standard stainless steel curettes should not be used on implants as they can scratch the implant surface. Dedicated implant curettes made from plastic, titanium, or resin are used instead — they remove biofilm without damaging the implant coating.

What is the difference between scaling and root planing?

Scaling removes calculus and plaque from tooth surfaces above and below the gum line. Root planing goes further — it smooths the root surface to remove contaminated cementum and create a clean, hard surface that promotes reattachment of the periodontal tissues. Curettes are used for both.

Is periodontal disease linked to other health conditions?

Yes. Research has established associations between untreated periodontal disease and systemic conditions including cardiovascular disease, diabetes, and stroke. Effective use of curettes in periodontal therapy therefore contributes to overall systemic health, not just oral health.