Crown lengthening is usually done so a tooth can be repaired. A gum lift is usually done so a smile looks more even. Both remove some gum, which is why the names get mixed up, but they answer different problems, and crown lengthening often reshapes a little bone as well.
Start with the reason, not the procedure
The quickest way to sort the two apart is to name the problem. If the teeth are healthy and the concern is how the gum line looks, for example a lot of gum on show or front teeth that look uneven in length, the conversation is about a cosmetic gum lift. If a tooth has broken or decayed down near or under the gum and there is not enough sound tooth above the gum for a filling or crown to hold, the conversation is about crown lengthening.
The instruments can be similar. What changes is how much tissue comes away, whether bone is involved, and what happens next.
A gum lift trims soft tissue to change the shape of the smile
A gum lift is also called gum contouring or gingivectomy. A small amount of excess gum is removed and the edge is shaped, using fine instruments or a soft tissue laser. It suits people whose teeth look short because gum covers more of them than usual, or whose gum heights differ from tooth to tooth.
Because only soft tissue is shaped, recovery tends to be quick and discomfort is usually mild. A gum lift is often planned together with other cosmetic work such as composite bonding or veneers, so the gum line and the teeth are designed together.
It is only one way to manage a gummy smile. When the extra gum on show comes from an active upper lip or the position of the upper jaw, trimming gum may change little, and our guide to gummy smile treatment explains the other causes.
Crown lengthening uncovers tooth so it can be restored
Crown lengthening removes gum and, in many cases, a small amount of the bone around the root. The aim is to expose enough healthy tooth for a restoration to seal properly, while leaving room for the gum to reattach at a healthy distance from the edge of the filling or crown.
That space matters. Gum and bone need a band of attachment above the bone, sometimes called the biologic width or supracrestal tissue attachment. If a crown edge is pushed down into that band, the gum tends to stay inflamed. Crown lengthening resets the gum and bone so the new margin can sit in a cleanable, stable position.
Common reasons include a tooth broken off at the gum line, decay that runs below the gum, an old crown that has failed with little tooth left, or a short tooth that cannot hold a crown. Because bone is often reshaped, it is a slightly larger procedure than a gum lift, and the area is left to heal for a period your dentist will set before the final crown is made.
A 2023 systematic review in the Saudi Dental Journal (Smith and colleagues) pooled four controlled studies and found that gum and bone levels at treated teeth were broadly stable at three and six months, compared with neighbouring teeth.
The two procedures side by side
| Gum lift | Crown lengthening | |
|---|---|---|
| Why it is done | Appearance of the gum line | To make room for a filling or crown |
| What is removed | A small amount of gum | Gum, and often some bone |
| Typical trigger | Gummy smile, uneven gum heights | Broken tooth, decay under the gum, short tooth |
| Recovery | Usually quick | Longer when bone is reshaped |
| What follows | Often bonding, veneers or whitening | A filling or crown once the gum has settled |
Things to weigh before either one
Teeth can feel sensitive for a while after gum is removed, because a little more tooth is exposed. Removing too much gum for appearance can make teeth look long or uncover root surface, so a measured, conservative plan is better than an aggressive one. Gum can also creep back slightly after soft tissue reshaping, particularly when bone is not changed, and dentists plan with that in mind.
Crown lengthening on a back tooth is not always the best option. If a great deal of bone would need to come away, or the tooth has a poor outlook for other reasons, alternatives such as orthodontic extrusion or removing and replacing the tooth may be discussed. If your gums have already shrunk back, that is the opposite problem, covered in our article on gum recession and grafting.
Common questions
Does crown lengthening hurt?
It is done with local anaesthetic, so you should not feel pain during it. Some soreness for a few days afterwards is common and is usually managed with over-the-counter pain relief.
Is a gum lift permanent?
The new gum line is generally stable once healed, although a small amount of rebound can happen. Gum disease later in life can change the gum line, so regular cleaning and check-ups still matter.
Can a laser be used for both?
A soft tissue laser can be used when only gum is being shaped. Some lasers can also reshape bone, but when bone needs reshaping, conventional surgical steps are often used.
Cost and next steps
Fees depend on how many teeth are involved, whether bone is reshaped and which restoration comes afterwards, so a quote is only possible after an examination. Current offers are on our deals page, and a general dental consultation is the place to start.
If you are unhappy with how much gum shows, or you have been told a tooth needs more length before a crown, the Lumi Dental team in Melrose Park can examine your teeth and gums and explain which option fits. You can reach us through our contact page.
This article is general information and is not a substitute for individual advice. A dentist can recommend the right approach after examining you.
