Crown Lengthening: What It Is, Why It Is Done, Procedure, Recovery, and Risks
Evidence: Cited sources
When you hear the words "crown lengthening," you may think that a dentist is going to make your tooth physically look longer. But that is not what happens; the reality is quite contrary.
Crown lengthening is a dental procedure that exposes more of the natural tooth by removing or reshaping some gum tissue. In some cases, a small amount of bone around the tooth may also need to be changed.
Sometimes a tooth is broken very close to the gumline. Sometimes decay has gone below the gum. And sometimes a person has more gum covering their teeth than they would like, making the teeth look short when they actually are normal in size. In these situations, crown lengthening can help expose more of the tooth and create a healthier or better-looking gumline.
The procedure is usually done by a dentist with training in gum surgery, such as a periodontist. Your treatment will depend on why you need it and how much tooth needs to be exposed.
What Is Crown Lengthening?
Crown lengthening is a type of gum surgery. The part of your tooth that you can see is called the clinical crown. It is the visible part of the tooth above the gumline. When too much gum covers the tooth, less of this surface can be seen.
During crown lengthening, the dentist changes the gumline so more of the natural tooth becomes visible. The dentist may remove some gum tissue. In certain cases, the bone around the tooth also needs to be reshaped. After this, the gum is placed around the tooth at a new level and may be held with stitches.
So, the tooth does not actually grow out of the gums. You are simply seeing more of the tooth that was already there.
Why Is Crown Lengthening Done?
There are several reasons why your dentist may suggest crown lengthening. Some are related to fixing a damaged tooth. Others are related to the appearance of your smile.
1. To Repair a Broken Tooth
Imagine that a tooth breaks very close to your gumline.
Your dentist wants to put a crown on it, but there is not enough healthy tooth showing above the gum to support the restoration properly.
This can be a problem.
A crown needs enough healthy tooth structure to hold onto. If there is too little tooth above the gum, the dentist may have difficulty getting a good fit.
Crown lengthening can expose more of the tooth. This gives the dentist more healthy tooth structure to work with.
2. To Treat Decay Below the Gumline
Tooth decay does not always stay in the part of the tooth you can easily see.
Sometimes decay extends below the gumline. If this happens, the dentist may have trouble reaching the damaged area.
Crown lengthening can expose that part of the tooth.
Once the area is easier to reach, the dentist can clean the decay and restore the tooth more effectively.
3. To Make a Gummy Smile Look Different
Some people show a lot of gum when they smile.
This does not mean there is something wrong with their gums. It may simply be the natural shape of their smile.
In some people, too much gum covers the teeth, making the teeth appear shorter.
Cosmetic crown lengthening can remove some excess gum tissue and change the shape of the gumline. This may make more of the teeth visible when you smile.
However, a gummy smile can have many causes. Crown lengthening is not the best option for every person with a gummy smile.
Your dentist first needs to find out why you show more gum.
Does Crown Lengthening Make Your Teeth Longer?
No.
This is probably the most common misunderstanding about the procedure. Your natural tooth does not become longer. Instead, some gum tissue, and sometimes bone, is removed so more of the existing tooth can be seen.
For example, suppose you have a tooth where only 7 mm of the crown is visible. If the gumline is moved down, perhaps 9 or 10 mm may become visible. The tooth itself has not grown.
More of it is simply exposed.
Does Crown Lengthening Remove Gum or Bone?
It depends on your individual case. Some people only need gum tissue to be reshaped or removed. Others need both gum and bone to be adjusted.
Your dentist looks at the relationship between the gum, tooth, and bone before deciding what needs to be done.
This is important because removing too little tissue may not give enough space for the final restoration. Removing too much can also create problems. The goal is to remove the amount that is needed while keeping the tooth and surrounding tissues healthy.
What Happens Before Crown Lengthening?
Before the procedure, your dentist will examine your teeth and gums.
They may:
Check your gum health
Measure the gum around the tooth
Examine the damaged area
Take dental X-rays
Check the number of healthy teeth available
Look at the bone around the tooth
Discuss the final crown or restoration if one is planned
If the procedure is being done for cosmetic reasons, your dentist will also look at your smile and gumline.
This planning stage is important. The dentist should know how much tooth needs to be exposed before surgery begins.
What Happens During the Procedure?
The exact procedure can be slightly different for every patient. But here is a simple idea of what normally happens.
Step 1: The Area Is Numbed
The dentist gives you local anesthesia.
This makes the area numb, so you should not feel sharp pain during the procedure.
You may still feel pressure or movement. This can feel strange, but it should not be painful.
Step 2: The Gum Is Carefully Moved
The dentist makes small cuts in the gum and gently moves the gum tissue away from the tooth.
This allows the dentist to see the tooth and, if needed, the bone around it.
Step 3: Extra Gum or Bone Is Removed
The dentist decides how much tissue needs to be changed.
If only gum tissue needs to be removed, the procedure may be simpler.
If the bone is too close to the planned gumline or restoration, some bone may also need to be reshaped.
This part of the treatment needs careful planning. The dentist does not simply remove as much gum as possible.
Step 4: The Gum Is Placed Back
After the tooth and bone have been treated, the gum is placed at the new position.
Stitches may be used to hold the gum in place.
The area is then allowed to heal.
How Long Does Crown Lengthening Take?
There is no fixed time duration that applies to each patient.
A procedure involving one tooth may be fairly quick. If several teeth are being treated, it can take longer. The amount of gum and bone that needs to be changed also affects the treatment time. Your dentist can tell you how long your appointment is likely to take after examining your mouth.
Is Crown Lengthening Painful?
During the procedure, the area should be numb because of local anesthesia. Afterward, you may have some discomfort. You could notice:
Soreness
Mild swelling
Gum tenderness
Bleeding
Tooth sensitivity
Discomfort while eating
The discomfort is often manageable, but it can vary from one person to another.
If bone has been reshaped, you may have more soreness compared with a simple gum-only procedure. Your dentist may recommend a pain reliever or other medication based on your situation.
What Is Crown Lengthening Recovery Like?
Recovery does not end when you leave the dental office. Your gums need time to heal and settle into their new position.
During the first few days, the area may feel sore. You may also notice some swelling or sensitivity. Your dentist will give you instructions about brushing, eating, and cleaning the area. You may need to avoid brushing directly over the surgical site for a short time. This does not mean you should stop cleaning your mouth completely.
Keeping your mouth clean is important for healing.
The gum can also change during the healing period. So, do not look in the mirror on day two and decide that this is your final result. It is not. The tissues continue to change for weeks and sometimes months.
What Can You Eat After Crown Lengthening?
Soft foods are usually easier during the early recovery period. You can consider foods such as
Yogurt
Eggs
Oatmeal
Mashed potatoes
Soft vegetables
Pasta
Smooth soups that are not very hot
Try to chew on the other side of your mouth if possible.
Hard and crunchy foods can irritate the area. Very spicy foods may also make the surgical site uncomfortable. You should follow the food instructions given by your own dentist because your surgery may be different from someone else's.
Can You Brush Your Teeth After Crown Lengthening?
Yes, but with caution. Your dentist may tell you to avoid brushing directly over the surgical area for a short period. You may also be given a special mouth rinse.
Do not scrub the stitches. You still need to keep the rest of your teeth clean. Poor oral hygiene can increase the chance of gum problems and may make healing harder.
If you are unsure about brushing around the treated tooth, ask your dentist before doing it.
Consult a physiotherapy and rehabilitation
How Long Does It Take to Heal?
The surface of the gums may start healing within days, but complete healing takes longer.
Stitches may sometimes be removed around one week after surgery, depending on the type of stitches and the procedure.
But the gumline itself may continue changing for several weeks or months. This is especially important if you are having crown lengthening before getting a permanent dental crown.
Your dentist may wait until the gum has become stable before completing the final restoration.
When Can You Get a Permanent Crown?
If crown lengthening was done because you need a dental crown, you may not get the final crown immediately. The gum needs time to heal. If the dentist places the final restoration while the gum is still changing, the gumline may later move and affect how the crown looks or fits. The waiting period depends on the tooth, the amount of surgery, and how quickly your tissues heal.
Your dentist will check the area during follow-up appointments and decide when it is ready.
Can the Gum Grow Back?
The gum can move during healing. This is sometimes called gingival rebound.
It does not necessarily mean that the procedure has failed. After surgery, the tissues naturally heal and can shift somewhat. The amount of change varies between people. This is one reason dentists do not always judge the final appearance immediately after the procedure.
If you had crown lengthening on a front tooth for cosmetic reasons, your dentist may monitor the gumline for some time before deciding that the result is final.
What Are the Risks of Crown Lengthening?
Crown lengthening is a common dental procedure, but it still has possible risks.
These can include:
Pain
Swelling
Bleeding
Infection
Tooth sensitivity
Gum recession
An uneven gumline
Changes in the appearance of the tooth
Delayed healing
Changes in the gum position during healing
Tooth sensitivity can happen because more of the tooth surface may become exposed.
For some people, the exposed tooth can be sensitive to cold drinks, hot foods, or sweet foods. This may improve as the area heals. But if sensitivity continues or becomes severe, tell your dentist.
Is Crown Lengthening Permanent?
The changes made during surgery can be long-lasting, but the gum is living tissue and can change. Some movement of the gumline can happen during healing. Good oral hygiene and regular dental visits are important after the procedure. They help your dentist monitor the gum and the tooth.
You should also follow the aftercare instructions carefully. Smoking can interfere with healing, so your dentist may advise you to avoid it during recovery.
Crown Lengthening for Cosmetic Reasons
When crown lengthening is done to improve a smile, planning becomes even more important. The dentist has to think about the shape of the teeth, the position of the gumline, and how much gum you show when smiling. For example, changing the gumline of one front tooth can sometimes make it look different from the tooth beside it.
That is why cosmetic crown lengthening should not be planned by simply saying, “Remove some gum.”
The dentist needs to decide where the new gumline should sit. A small difference can affect how the smile looks.
Crown Lengthening vs. Gum Contouring
Gum contouring usually refers to reshaping the gumline, often for cosmetic reasons.
Crown lengthening is a surgical procedure that may involve removing gum tissue and, when needed, reshaping bone.
They can look similar in some cases, but they are not always the same treatment. Your dentist can explain which procedure you need after checking your gums, teeth, and bone.
Who May Need Crown Lengthening?
You may be a candidate for crown lengthening if:
A tooth is broken close to the gumline
Decay extends below the gum
A crown needs more healthy tooth structure to hold properly
Too much gum covers the visible tooth
Your gumline needs reshaping for cosmetic reasons
Your dentist needs better access to a damaged part of the tooth
But having one of these problems does not automatically mean you need crown lengthening. Another treatment may sometimes be better. Your dentist needs to look at the condition of the tooth and its supporting tissues before making that decision.
What Questions Should You Ask Your Dentist?
Before having crown lengthening, you can ask your dentist a few simple questions.
Why do I need crown lengthening?
This tells you whether the treatment is for a damaged tooth, a restoration, cosmetic reasons, or something else.
Will you remove gum, bone, or both?
This gives you a better idea of what the surgery involves.
How much of my tooth will be exposed?
This is particularly important for front teeth, where appearance matters.
How long will I need to wait before my final crown?
Knowing this helps you plan your dental treatment.
What should I eat after surgery?
Your dentist can give you advice based on the exact procedure.
When should I return for a check-up?
Follow-up visits help your dentist make sure the area is healing properly.
References
- Yaneva B, Pecheva A, Hristamyan M. Crown Lengthening Procedures: Biological Foundations, Clinical Outcomes, and Contemporary Approaches in Flapless and Flap Techniques: A Narrative Review. Dent J (Basel). 2026;14(7):413. · source
- Cambridge University Hospitals NHS Foundation Trust. Crown lengthening surgery. Patient Information. Updated January 14, 2025. · source
Frequently asked questions
Is crown lengthening a major dental procedure?
It is a surgical dental procedure, but the size of the treatment varies. Treating one tooth may be much simpler than treating several teeth or reshaping bone.
Can crown lengthening save a broken tooth?
In some cases, yes. If enough healthy tooth remains and the tooth can otherwise be restored, exposing more tooth structure may allow a crown or other restoration to be placed.
But not every broken tooth can be saved with crown lengthening.
