Crown lengthening is a dental surgery that removes gum tissue, bone, or both to expose more of a tooth’s surface. It’s one of the most common periodontal procedures, performed either to make room for a dental restoration like a crown or to improve the appearance of a “gummy” smile. The surgery is typically done by a periodontist under local anesthesia, and most patients return to normal activities within a week.
Why Crown Lengthening Is Needed
Your teeth are longer than what you see above the gum line. The visible portion is the “clinical crown,” and sometimes there isn’t enough of it exposed to work with. This creates two distinct problems, one functional and one cosmetic, and crown lengthening addresses both.
Functional Reasons
When a tooth breaks near the gum line, develops deep decay, or is otherwise too short to hold a dental crown, your dentist needs more tooth structure to anchor a restoration. Placing a crown margin too close to the bone violates what dentists call the “biologic width,” a roughly 2-millimeter zone of soft tissue attachment between the edge of the bone and the base of the gum pocket. This zone acts as a biological seal. When a restoration encroaches on it, the result is chronic gum irritation, plaque buildup, and bone loss around the tooth. Crown lengthening moves the gum line and sometimes the bone level downward, creating the space needed for a properly fitting restoration without triggering that inflammatory response.
Cosmetic Reasons
Some people show an unusually large band of gum tissue when they smile. This “gummy smile” often results from a condition called altered passive eruption, where the gums never fully receded during tooth development, leaving teeth that look short even though they’re normal-sized underneath. Cosmetic crown lengthening reshapes the gum line and, when necessary, recontours the bone to reveal more tooth. A study evaluating this approach found an average increase of 1.6 mm in visible crown height one year after surgery, with stable, predictable results at the gum margin.
How the Procedure Works
The specific technique depends on what needs to happen. In the simplest cases, only excess gum tissue is removed, a procedure called gingivectomy. When bone also needs to be adjusted, the periodontist lifts a flap of gum tissue, removes or reshapes the underlying bone, then repositions the tissue at a lower level and sutures it in place. A third option involves gently loosening and repositioning the tooth itself (surgical extrusion) rather than cutting away tissue. Your periodontist will choose the approach based on the tooth’s location, the amount of exposure needed, and whether the goal is restorative or cosmetic.
The surgery itself is performed under local anesthesia and typically takes 30 to 60 minutes, depending on how many teeth are involved. At the end of the procedure, a periodontal dressing (a protective bandage-like material) is placed over the surgical site. Sutures are usually removed about 10 days later.
Recovery: What to Expect Week by Week
The first day after surgery brings mild swelling, some bleeding, and discomfort around the site. Applying ice packs in 15-minute intervals helps manage swelling, and you’ll want to eat only soft foods while avoiding anything hot or spicy. Swelling typically peaks around days two to three, and some bruising is normal during this window.
By the end of the first week, pain and swelling should be noticeably decreasing. A follow-up appointment is usually scheduled during this period to remove the periodontal dressing and check the site. You can gently brush the treated area with a soft manual toothbrush after the first 24 hours, but avoid flossing the surgical site and skip mouthwash, salt water rinses, and peroxide rinses for the full first week. Untreated areas of your mouth can be cleaned normally.
During weeks two and three, the gum tissue begins to stabilize and reattach. Any remaining stitches are removed, and you can gradually bring firmer foods back into your diet. By weeks four to six, the gum line starts looking more natural and the inflammation resolves. Some temperature sensitivity may linger, especially if root surfaces were exposed during surgery. If the procedure was done to prepare for a crown or other restoration, that work typically begins about two months after surgery, once the tissues have fully healed and settled into their new position.
Risks and Side Effects
Crown lengthening is a well-established procedure, but it carries the same risks as any oral surgery: post-operative pain, swelling, bruising, bleeding, and a small chance of infection. The most common side effect is tooth sensitivity to hot, cold, and sweet foods and drinks. Because the surgery exposes more of the root surface (which lacks the hard enamel coating that protects the crown of the tooth), sensitivity is almost expected. It usually fades within a few weeks, though it can sometimes persist longer.
Throughout recovery, avoid tobacco, alcohol, and strenuous physical activity, all of which can slow healing. Stay away from sharp and crunchy foods like chips and nuts, and skip spicy or acidic foods until the site has had time to stabilize. Drinking plenty of fluids supports the healing process.
Long-Term Success Rates
A retrospective study tracking teeth that were structurally compromised (broken, heavily decayed, or otherwise damaged) and then saved with crown lengthening followed by restoration found a cumulative survival rate of 88.3% at five years, 78.4% at 10 years, and 68.1% at 15 years. The most common reasons for eventual failure were new cavities forming around the restoration (35.2% of failures), tooth fracture (29.6%), complications with root canal treatment (23.9%), and gum disease progression (11.3%). Patients with a high risk of fractures or cavities had a greater chance of long-term failure, which suggests that how well you care for the tooth afterward matters as much as the surgery itself.
Cost and Insurance Coverage
For straightforward cases where only gum tissue is reshaped, crown lengthening typically costs between $800 and $2,000 per tooth. When bone removal is involved, the price rises to roughly $2,000 to $3,000 per tooth. Multiple teeth treated at once will increase the total, though some periodontists offer bundled pricing.
Insurance coverage depends on the reason for the procedure. If crown lengthening is medically necessary to allow a restoration to be placed, dental insurance often covers a portion of the cost. If it’s done purely for cosmetic reasons, such as correcting a gummy smile, insurance typically won’t contribute. It’s worth having your periodontist submit a pre-authorization to your insurer before scheduling, so you know exactly what your out-of-pocket cost will be.