Crown Lengthening: When and Why It Is Done

Crown lengthening is the surgical reshaping of gum tissue (and sometimes underlying bone) to expose more of the natural tooth. It is done for two distinct reasons — restorative necessity and cosmetic aesthetics — and the techniques involved differ accordingly. Here is the practical clinical picture for UK patients.

The two indications

Crown lengthening is performed for one of two reasons:

Restorative crown lengthening

When a tooth is broken near the gum line, decayed below the gum margin, or has insufficient height for a crown to be retained, the dentist needs more tooth structure to work with. Crown lengthening exposes 3–4 mm of additional tooth, providing the “biological width” required for a healthy gum-restoration interface. Without this, the restoration sits on the gum tissue, causing chronic inflammation, bleeding, and eventual periodontal pockets.

Cosmetic crown lengthening (gummy smile)

When the teeth appear short because the gum tissue covers a disproportionate amount of the crown — the “gummy smile” presentation — crown lengthening reshapes the gum and bone to reveal more of the existing tooth. This is purely aesthetic, and the case selection is critical: the wrong patient will end up with sensitive teeth, asymmetric gum lines, or compromised tooth support.

The procedure: gingivectomy vs full crown lengthening

The choice depends on whether bone needs reshaping in addition to gum tissue:

Gingivectomy alone

If the gum is excess but the underlying bone is at the correct level, a simple soft-tissue trim is sufficient. Performed under local anaesthesia with a scalpel, electrocautery, or laser. Healing is rapid, typically 7–14 days. Suitable when the excess is purely soft tissue.

Crown lengthening with osseous (bone) recontouring

When the bone is also at a higher level than ideal, a full-flap procedure is needed. The gum is reflected, the bone is reshaped with handpieces and surgical files to provide 3 mm of space between the future restoration margin and the underlying bone, then the gum is sutured back at the new level. Healing 6 weeks before final restoration. This is the more common procedure for restorative cases.

Recovery: what to expect

• Day 0–2: mild bleeding and swelling, controlled with ice and elevation. Soft food diet.
• Day 3–7: gradual reduction in swelling. Sutures removed at day 7–10.
• Week 2–6: gum tissue matures into final position. Some patients perceive ongoing soft-tissue settling for several months.
• Week 6+: tissue stable enough for final crown or veneer impression. Premature impression results in ill-fitting restoration once the tissue settles.

Who is a candidate, and who is not

Suitable candidates have:

• Adequate bone support around the tooth (probing depths within healthy limits).
• No active periodontal disease.
• Sufficient remaining tooth structure to accommodate the lengthening.
• Reasonable expectations — the gum line cannot be moved unlimited distances.

Not suitable:

• Patients with thin gum biotype where exposed root surface will look unattractive.
• Teeth with severe bone loss already.
• Patients whose gummy smile is caused by upper lip hypermobility — the lip rises too high in their smile, not the gums being too low. These patients benefit from Botox to the lip elevators or surgical lip repositioning, not crown lengthening.

The alternative diagnoses for “gummy smile”

Before committing to surgery, the cause of the gummy appearance should be diagnosed:

• Altered passive eruption: the gum sits at its baby-tooth level even after the permanent tooth has erupted. Crown lengthening corrects this.
• Vertical maxillary excess: the upper jaw bone has grown excessively. Treated with orthognathic surgery (rare, severe cases) or with non-surgical alternatives like Botox.
• Lip hypermobility: the upper lip rises too high in smile. Botox to lip elevator muscles or surgical lip repositioning.
• Short clinical crowns from wear: bruxism has worn the front teeth down. Treatment is rebuild with composite or veneers, not crown lengthening.

For UK patients

Crown lengthening for restorative reasons is typically straightforward and is offered by NHS general dentists with surgical interest, periodontists, and prosthodontists. Cosmetic crown lengthening for gummy smile correction is usually private — costs in the UK run from £400 per tooth for simple gingivectomy to £1500+ per quadrant for surgical crown lengthening with bone recontouring. Istanbul pricing is confirmed in your written treatment plan and is part of the smile design package when combined with restorative work. Our gum aesthetics guide covers the related procedures of gum contouring and dark gum lightening.

Frequently asked questions

Is crown lengthening painful?

The procedure itself is performed under local anaesthesia and is not painful. Post-operative discomfort is moderate for 3–5 days, well-controlled by paracetamol and ibuprofen rotation. Most patients are back to normal activity within a week.

How long until I can have my final crown placed after crown lengthening?

For purely aesthetic cases, the final restoration can typically be placed at 8–12 weeks. For full crown lengthening with bone recontouring, 6 weeks minimum, ideally 12–16 weeks for complete tissue maturation. Premature impression captures the wrong gum level and the crown looks short or has visible margin within months.

Will my teeth be sensitive after crown lengthening?

Some sensitivity to cold is common for the first 2–6 weeks because root surface that was previously covered by gum is now exposed. Most patients adapt within a few weeks. Ongoing sensitivity is treated with desensitising toothpaste, fluoride varnish at routine appointments, or in stubborn cases a minor restorative filling on the sensitive area.

Can crown lengthening be reversed if I do not like the result?

Soft-tissue gingivectomy can sometimes be partially reversed by allowing tissue regrowth, but it does not reliably return to its original position. Bone recontouring is permanent — the bone has been physically reshaped. Case selection and pre-op planning are critical for this reason; conservative discussions before surgery are essential.