Crown Lengthening Surgery: What Happens, Step by Step

Crown lengthening is a small operation by periodontal standards, but it is still surgery. Knowing the sequence removes most of the fear: you will know what is being done, how long it takes, what you will feel and what the next three months look like.

This walkthrough describes the common path for a single tooth that needs crown lengthening before a restoration, with notes where an aesthetic multi-tooth case differs.

Before the surgery: the consultation

The consultation is not a formality. The periodontist needs to answer four questions:

1. How much sound tooth is available? Radiographs show the bone level and the extent of decay or fracture. A probe measures the gum attachment.
2. How much tooth can be exposed safely? Removing bone affects the support of the tooth and its neighbours. The surgeon plans the new bone level, not just the new gum line.
3. Is the tooth restorable? A tooth fractured too far below the bone, or with insufficient root support, may not be a candidate. The extraction comparison covers that decision.
4. What does the restoring dentist need? The crown margin, the material and the planned tooth proportions determine how much tooth the surgeon has to expose.

Bring the referral, the radiographs and a list of medications. Tell the surgeon about blood thinners, diabetes, smoking, previous periodontal surgery and any clenching or grinding. Those factors change the plan and the healing expectations.

On the day: the sequence

1. Preparation and anaesthesia

The site is cleaned and anaesthetised with local anaesthetic. The surgeon checks that the area is fully numb before starting. If you have chosen oral or IV sedation, that is administered and monitored according to the practice’s protocol; you will need an escort home.

2. Measuring the new gum line

For a functional case, the surgeon measures from the planned crown margin to the bone. For an aesthetic case, the new gum line is planned against the smile, the tooth proportions and the adjacent teeth, often with photographs or a digital mock-up. This is the step that determines the final result, and it is worth asking about before the day of surgery.

3. Gingivectomy or flap

In a gingivectomy, the surgeon removes the marked strip of gum with a scalpel or laser. There is no flap and usually no bone work.

In a flap procedure, an incision separates the gum from the tooth, and the tissue is lifted enough to expose the bone. The flap is kept moist and handled gently; the goal is to preserve the blood supply so the gum heals back into place.

4. Bone recontouring

If bone is being removed, the surgeon uses a rotary instrument to reduce the crest around the tooth to the planned level. The amount is deliberate: enough to create the 3 mm of space the restoration needs, not so much that the tooth loses support. The bone may also be smoothed to remove a defect or to blend the site into the neighbouring teeth.

This is the part that distinguishes crown lengthening from a simple gum trim, and the part that makes the recovery longer.

5. Positioning and sutures

The flap is positioned at the new gum line and secured with sutures. The surgeon checks that the tissue sits flat against the tooth, that the papillae are supported and that the site is stable. A protective dressing may be placed, though many periodontists now leave the site open or use a thin adhesive.

6. Instructions and discharge

You leave with written aftercare: what to eat, what not to rinse, how to take pain relief, when to call and when to return. The first 24 hours matter most for bleeding and clot stability.

How long it takes

These are planning estimates. Molar sites, re-treatment and combined procedures take longer.

The first two weeks

Days 1–3: swelling peaks around 48 hours, and the gum is sore. Ice in 20-minute bursts for the first day, sleep with the head slightly elevated, and take the pain relief the office recommends. Avoid rinsing, spitting, smoking and straws for the first 24 hours; the clot needs to settle.

Days 3–7: swelling settles, and eating becomes easier. Keep to soft, cool foods and chew on the other side. Brush the rest of the mouth normally and follow the office’s instruction for the surgical site.

Days 7–14: the suture-removal visit. The surgeon checks the gum position and the healing. Most patients are comfortable by this point, though the site may still look red and feel tender to pressure.

The full recovery guide has the day-by-day detail and the warning signs.

Weeks 2 to 12: the gum matures

The gum surface closes within one to two weeks, but the tissue underneath keeps remodelling. The gum line can move slightly as it settles, which is why the final crown is not made immediately. Most clinicians wait 6 to 12 weeks before the final impression, and some prefer about 3 months for aesthetic cases where the gum line must be stable.

During this window:

• The new gum line may look uneven at first; it usually evens out as swelling resolves.
• Teeth may be sensitive to cold or brushing. This is common and usually settles, but report pain that worsens.
• The temporary crown, if one was placed, may need adjustment as the gum changes.
• Keep the site clean. Plaque at the margin is the main preventable cause of a poor result.

When the crown goes on

The restoring dentist prepares the tooth, takes the final impression or scan and places the crown. The surgeon and dentist should agree that the gum is stable and the margin is clean before the impression. If the gum is still changing, waiting a few weeks is cheaper than remaking a crown.

What can go wrong

Crown lengthening is predictable, but it is not risk-free. Bleeding, infection, recession, sensitivity, a shifting gum line and damage to a neighbouring tooth are possible. The risks guide explains each one and the signs that need a call. Most complications are manageable when they are caught early.