All-on-4 vs All-on-6: The Price Gap and When It’s Worth It

Quotes for a fixed full-arch bridge usually come in two versions: four implants or six. The six-implant plan almost always costs more. This guide sets the published price gap next to the outcome research, so you can judge whether the extra cost buys anything for your mouth. For the four-implant basics, see our All-on-4 cost page.

What actually differs between the two

Both plans replace every tooth in one jaw with a single fixed bridge that screws onto implants. The names describe the number of implants per arch. The differences that drive cost are mostly mechanical:

• Two more implants and abutments. Each extra fixture adds surgical time, an implant, an abutment and matching components in the final bridge.
• Where the back implants go. Four-implant designs usually tilt the rear implants to reach existing bone. Six-implant designs place fixtures further back, where a bone graft or sinus lift is more often needed. One US cost guide estimates that grafting adds $2,000–$4,000 and several months of healing.¹
• Cantilever length. The bridge extends past the last implant on each side. Implants placed further back usually mean a shorter unsupported span, so chewing force is spread over more fixtures.

The final bridge itself costs about the same either way. One guide that breaks down components puts a zirconia prosthesis at $10,000–$12,000 for both plans, with the difference sitting in implant and surgery fees: $12,000–$15,000 for four versus $15,000–$18,000 for six.¹ Those are one publisher’s estimates, not a fee schedule, but they match how itemized quotes are usually laid out.

US prices: what the published numbers show

There is no official US price for either plan. Cost guides built on different data disagree by thousands of dollars, partly because some report average fees and others all-in packages.

Published ranges as of October 2026, not quotes. Your price depends on extractions, grafting, bridge material and region.

The useful number is the gap. The one guide above that prices both plans side by side estimates All-on-6 at about $3,000–$8,000 more per arch, or roughly $1,500–$4,000 per additional implant before any grafting.¹ The marketplace’s US comparison figures differ by about $1,000, though they are single averages rather than ranges.⁸⁵

If you are treating both jaws, the gap doubles too, because you are adding four implants rather than two. One consumer guide that treats CareCredit’s figure as per arch says a two-arch All-on-4 case typically runs $24,000–$55,000.⁹

Colombia and abroad: the price snapshot

Published Colombian prices for six-implant arches are harder to find than for four. The marketplace Bookimed lists several Medellín clinics for both procedures but shows “price on request” for each of them, giving only US and Turkey comparison figures.⁵⁸

The clearest published Colombia ranges come from PlacidWay, another marketplace, which says its Colombia price data was last verified June 1, 2026:⁴

Marketplace price snapshots. PlacidWay gives its All-on-6 range for Colombia overall, not Medellín specifically. The gap row is simple subtraction of the published endpoints.

In absolute dollars, the two extra implants cost less in Colombia. These are marketing ranges, though, not quotes: they rarely say which bridge material is included, how many visits it takes, or who pays for a repair. If a six-implant plan needs a graft the four-implant plan avoids, expect added healing time and possibly an extra trip. For city-level context see our Medellín price guide and MedellinDentalImplants.co.

What the outcome research says

The honest summary: for an average-risk patient, studies have not found that six implants last meaningfully longer than four. Differences show up in specific risk groups.

The largest direct comparison

A retrospective cohort study in Clinical Implant Dentistry and Related Research (2023) followed 217 patients with 1,222 implants supporting 271 immediate full-arch prostheses, 202 on four implants and 69 on six, for 3 to 13 years.⁶ Across the whole group, it found no statistically significant difference between the designs in:

• implant survival (hazard ratio 1.0, P = 0.96)⁶
• prosthesis survival (P = 0.56)
• biological complications, meaning gum and bone problems around implants (P = 0.78)
• technical complications with the temporary or final bridge, and marginal bone loss at 1, 5 and 10 years

In some subgroups, though, six implants were more predictable on some measures: older patients, people whose opposing jaw had natural teeth or a fixed bridge, smokers, people with bruxism (tooth grinding), long cantilevers, low bone density, and all-acrylic temporary bridges.⁶ The authors also surveyed experienced clinicians, and implant prosthodontists significantly favored six implants when making the decision.

A 2026 review of the wider evidence

An August 2026 narrative review in the Danish dental journal Tandlægebladet covered literature from 2003 to 2025, including two head-to-head randomized trials with 5-year and 3-year follow-up.⁷ It reported implant survival of 98.75–100% for four-implant designs and 95–99.4% for six, with no statistically significant difference, and comparable bone loss. Some meta-analyses it discusses suggest less bone loss and fewer technical complications with six implants. Engineering models show lower peak stress with six, but that has not translated into clinically relevant differences.⁷

The review is clear about the limits: evidence beyond 10 years is thin, and so is evidence for people with severe (stage IV) gum disease. A history of periodontitis markedly raises the risk of peri-implantitis, and fewer implants may make good hygiene harder to achieve.⁷

When two extra implants are worth paying for

Putting the cohort study and the review together, a six-implant arch is most worth discussing when one or more of these apply:⁶⁷

• You grind or clench your teeth (bruxism).
• You smoke.
• Your bone density is low.
• Your bridge would have long cantilevers, with back teeth hanging far past the last implant.
• The opposing jaw has natural teeth or a fixed bridge (a cohort-study subgroup).
• You have a history of serious gum disease. The review stresses intensified maintenance before and after treatment, whichever design you choose.

When none of those apply, the 2026 review concludes four implants give outcomes comparable to six in standard-risk patients.⁷ It adds that avoiding bone augmentation shortens treatment, reduces surgical morbidity and lowers cost. If six implants would require grafting you could otherwise skip, the gap widens and the timeline stretches; see our bone graft cost guide.

How to compare a 4-implant and a 6-implant quote

Dental insurance typically does not fully cover implants because most plans treat them as elective,¹⁰ so most of this difference will come out of your pocket. Make the comparison fair before you decide:

1. Ask the same dentist about both options, and why the one they don’t recommend suits your bone, bite and habits less well.
2. Base it on a 3D scan. The choice depends on bone volume and where the sinus and nerve sit.
3. Itemize both quotes the same way: implants, abutments, extractions, grafts or sinus lifts, sedation, temporary bridge, final bridge material, follow-up visits.
4. Check the bridge material. In one guide’s breakdown the bridge is the largest single line item in either plan.¹
5. Ask what happens if one implant fails, and how a replacement would be billed.
6. Check the timeline. Cleveland Clinic says the implant process may take six to 12 months, and a bone graft typically needs about three months to heal before an implant goes in.¹⁰

DentalQuote.co explains how to request comparable written estimates, and AllOn4Cost.co goes deeper on full-arch pricing.

The bottom line: two extra implants usually add a few thousand dollars per arch in the US, and less abroad. For most standard-risk patients the research shows no clear payoff; for grinders, smokers, soft bone and long cantilevers, it may be money well spent. Your surgeon, looking at your scan, should make that call with you.

This article summarizes published guidance and prices for general information. It is not medical advice. A licensed professional who has examined you decides what treatment is right and whether you are fit to travel. Prices are published ranges as of October 2026, not quotes.