Scaling and Root Planing

Supragingival scaling removes plaque and calculus from the coronal (crown) portion of the tooth, above the gumline. This is visible to the naked eye, is easier to access, and is part of routine prophylaxis (cleaning) that all patients receive. Subgingival scaling removes plaque and calculus from the surfaces of the root that lie below the gumline, inside the periodontal pocket. This is the core of scaling and root planing (SRP) and requires careful instrumentation and often local anesthesia. Subgingival calculus is harder and more tenacious than supragingival calculus and requires area-specific curettes and careful stroke technique to avoid damaging the root surface. SRP is indicated for patients with periodontitis (bleeding gums, pocket depths greater than 3–4 mm, bone loss). A patient with healthy gums and no pocket depth needs only supragingival prophylaxis; a patient with periodontitis needs SRP to arrest disease progression.

Hand instruments require precise technique to remove calculus without damaging the underlying root anatomy. Grasp the curette with a modified pen grip (thumb and two fingers), with your hand resting on the teeth or chin (fulcrum) for stability. Position the curette blade at a 45-degree angle to the root surface (not perpendicular, which gouges). Use gentle but firm pressure; let the sharp blade do the work, not brute force. Activate the instrument with short, precise push or pull strokes, staying within the pocket. For universal curettes, you can pull and push; for area-specific curettes (Gracey), use only the pull stroke. Work methodically from tooth to tooth, section by section. Stop frequently to check tactile feedback with a probe: the root should feel smooth, not rough. If the instrument is dull, it will skid and require more force, increasing the risk of root damage. Keep instruments sharp (sharpen every five to ten patients or when they stop catching). On the root surface, you are removing not just calculus but the contaminated, diseased cementum layer. This is intentional; a thoroughly planed root surface has better healing potential.

Ultrasonic scalers use high-frequency vibration (25,000–40,000 cycles per second) to shatter and dislodge calculus and biofilm; they are faster than hand instruments and are excellent for bulk removal of supragingival and moderately tenacious subgingival calculus. The ultrasonic tip is held at a light angle and allowed to vibrate against the calculus; you do not press hard. Ultrasonic scalers are less tiring for the clinician and can reach deeper areas quickly. However, they produce heat and water spray, require a steady hand to avoid trauma, and may not remove all subgingival calculus or polish the root surface as thoroughly as hand instruments. Best practice in SRP: use the ultrasonic scaler for initial calculus removal (bulk debridement), then finish with hand curettes for final root planing and tactile confirmation of smoothness. This combination is faster and more effective than either method alone. Some clinicians prefer hand-only for patients with sensitive teeth or exposed root surfaces; ultrasonic can be painful on sensitive dentine if the water coolant is inadequate. Patients with pacemakers or those who are immunocompromised may need hand instrumentation only due to the ultrasonic's intense activity and water spray.

SRP can be uncomfortable because the subgingival pocket is sensitive and instrumentation stimulates inflammation. Topical anesthesia (benzocaine gel) applied to the gumline provides surface analgesia. For deeper, more effective anesthesia, local infiltration or block anesthesia is required: inject 2% lidocaine (often with epinephrine for vasoconstriction to prolong effect) into the area being treated. Quadrant-based SRP allows you to anesthetize one quadrant at a time and work for 40–60 minutes within that area while the anesthesia is active. Full-mouth SRP in one or two visits requires more aggressive anesthesia or may be split into multiple appointments. Some patients prefer nitrous oxide (laughing gas) combined with local anesthesia for anxiety relief. Always test that anesthesia is working by touching the gum with an instrument; if the patient feels it, inject more. Poor anesthesia is the top complaint on evaluations, so take the time to get it right. Postoperative sensitivity is expected for a few days; advise patients to use a soft toothbrush and sensitivity toothpaste.

Immediately after SRP, expect some bleeding, soreness, and sensitivity to temperature and pressure. The gums may appear red and swollen for 48 hours; this is normal inflammation as healing begins. Within 72 hours, inflammation starts to resolve, and the patient should notice less bleeding with brushing. The healing process continues for 4–6 weeks; during this time, the periodontal ligament and bone begin to reattach, and pocket depths should decrease by 1–2 mm on average. Full re-epithelialization (tissue closure) occurs within 2–3 weeks. Patients are advised to avoid hard, sticky, or hot foods for the first week and to maintain excellent oral hygiene with a soft toothbrush. Antimicrobial rinses (chlorhexidine or povidone-iodine) can be prescribed for the first 2 weeks to reduce bacterial burden and inflammation. No heavy exercise or swimming for 3–5 days to avoid disrupting the blood clot. After 4–6 weeks, a re-evaluation is scheduled: probe again to assess pocket reduction and gum health. If pockets remain deep (≥5 mm) despite good home care, referral to a periodontist for surgical therapy (flap surgery, bone grafts) may be indicated. Good healing is dependent on excellent home care (daily flossing, twice-daily brushing, perhaps irrigators) and smoking cessation.

Scaling is the removal of calculus and plaque from the tooth surface. Root planing is the removal of contaminated cementum and diseased tooth structure to create a biologically acceptable root surface that can be recolonized by periodontal ligament fibers and bone. In clinical practice, SRP is done together, but the planing phase is the critical step for healing. You know the root is adequately planed when it feels smooth to the probe and curette: no rough spots, pits, or catches. Run a probe down the root surface in multiple directions; it should glide smoothly like a polished surface. Visually, a planed root surface is lighter in color (freshly exposed dentin/cementum) compared to the discolored subgingival surface above it. Tactile feedback is the most important indicator; a dull curette will not achieve smoothness, so instrument sharpness is critical. Over-planing (removing too much cementum) can cause sensitivity and root resorption; the goal is thorough but conservative removal of diseased tissue only. With experience, you develop a feel for when the root is ready.

Complications include: (1) Root sensitivity: caused by exposed dentin or over-planing; managed with desensitizing toothpaste, fluoride varnish, or bonded resins. (2) Gum recession: slight recession is expected as inflammation resolves; excessive recession (>3 mm) indicates over-instrumentation and poor technique. (3) Furcation involvement: if the SRP site was a multi-rooted tooth with bone loss extending into the furcation (where roots split), SRP may not fully arrest disease; the patient may need referral for furcation debridement or surgical therapy. (4) Abscess formation: rare but can occur if a deep pocket is sealed by new epithelium trapping bacteria inside; managed by drainage and further instrumentation. (5) Nerve damage: very rare; median or inferior alveolar nerve block can cause temporary paresthesia (numbness); resolves within days or weeks. (6) Anesthetic toxicity: overdose of local anesthetic can cause lightheadedness, seizures, or arrhythmias; use safe doses and aspirate before injection. Prevention: careful technique, proper anesthesia, sterilization, and systematic evaluation of healing at re-check appointments.

Before SRP: take a full periodontal chart (probing depths, bleeding on probe, plaque index, mobility, furcation involvement) and document radiographs. Chart each tooth surface (buccal, lingual, mesial, distal) with probing depth and bleeding status. After SRP: document the number of teeth treated, area (full mouth versus quadrant), anesthesia used, and any complications or notes on difficulty. At re-evaluation (4–6 weeks post-SRP): re-probe all sites and compare probing depths to baseline; a reduction of 2–3 mm is typical and indicates successful healing. If pockets remain ≥5 mm despite good home care, or if there is continued bleeding, document this and refer to a periodontist for surgical evaluation. Re-evaluation is critical because it shows the outcome of your work and guides the next phase of care (maintenance, surgery, or extraction if tooth is hopeless). Documentation must be detailed and legible because if the case goes to litigation (failed implant, extraction, malpractice claim), your chart is the evidence of the standard of care you provided.