A gummy smile — where you see more gum than tooth as you smile — ranks among the cosmetic worries patients raise most often at consultations. What surprises most of them is that several distinct causes exist, and the right treatment hangs entirely on which one is at play. Here's how to figure out what's behind yours and what can actually be done.
What Counts as a "Gummy Smile"?
As a rule of thumb, displaying more than 3–4mm of gum while smiling qualifies as excessive gingival display. Research indicates roughly 10% of adults aged 20–30 feel self-conscious about a gummy smile, and it shows up more often in women than men. Although it's strictly a cosmetic matter, it can take a real toll on how confident someone feels showing their smile.
The 4 Main Causes — and Their Treatments
1. Altered Passive Eruption — Most Common Cause
As teeth come in normally, the gums pull back to reveal the entire crown. With altered passive eruption, that recession never fully happens — the gums keep partially covering the teeth, so they look short even though full-sized teeth are sitting underneath. The teeth aren't small; they're simply concealed.
Dr. C resculpts the gumline with a soft-tissue laser or scalpel, taking away the surplus tissue to reveal the whole tooth. It runs 1–2 hours under local anesthesia, and the result is permanent. Cost: $150–$350 per tooth. Often this is all that's needed — no veneers required when the teeth beneath are healthy and well-formed.
2. Hypermobile Upper Lip
In some people the upper lip rises higher than usual during a smile, uncovering gum that would normally stay hidden. The gum coverage and tooth length are actually fine — it's the lip's motion that creates the look. This is an anatomical or muscular trait rather than a dental flaw.
A small dose of Botox in the upper lip muscles curbs how far they contract, holding the lip lower. The effect lasts 3–6 months and needs upkeep. Lip repositioning surgery is a permanent alternative. Botox cost: $200–$400 per treatment.
3. Short Upper Lip
A naturally short upper lip shows more gum during a smile simply because there's less tissue to cover it. The teeth and gums themselves are normal — it's the lip's anatomy driving the appearance.
Lip repositioning surgery can extend the upper lip. In certain cases, crown lengthening alongside veneers can shift the apparent gum-to-tooth balance even without lip surgery. Dr. C will weigh the particulars at your consultation.
4. Vertical Maxillary Excess (Jaw Overgrowth)
Sometimes the upper jaw grew too tall vertically during development, which pushes the gums lower than they should sit. This is the most structural cause and produces the most pronounced gummy smile — frequently alongside an open bite or other bite problems.
This calls for surgical repositioning of the upper jaw by an oral and maxillofacial surgeon — outside the range of general dentistry. Dr. C can determine whether this is the cause and make the right referral.
Crown Lengthening + Veneers — The Common Combination
The gummy smile treatment we use most often at Merry Dental Hub is crown lengthening followed by porcelain veneers. Here's the reasoning:
- Crown lengthening clears away excess gum and brings the full tooth into view
- After years of partial coverage, the newly exposed teeth can look a little uneven in shape
- Veneers then deliver consistent shape, ideal proportions, and uniform color across the smile zone
- Together the effect is striking — an even gumline, an ideal tooth-to-gum ratio, and a complete smile redesign
Not every gummy smile patient needs veneers after crown lengthening — when the teeth underneath are well-shaped and nicely colored, crown lengthening on its own can be a finished result. Dr. C evaluates this at your consultation using digital smile design.
Find Out What's Behind Your Gummy Smile
Book a free smile design consultation with Dr. C. He'll pinpoint the cause and recommend the right treatment — including when the answer is simpler and cheaper than you'd expect.
Medically reviewed by Dr. Chakrapani Nannapaneni, DDS — UCSF School of Dentistry · ADA Member · Merry Dental Hub, 2260 Country Club Rd Suite 101, Wylie TX 75098 · (972) 483-4848