All-on-4 vs. All-on-6 Dental Implants: Which Is Better?

Editorially reviewed by the Dental.me Editorial Team · Updated July 2026

If you are missing most or all of the teeth in one jaw, your dentist may have raised two similar-sounding options: All-on-4 and All-on-6 dental implants. Both replace an entire arch of teeth with a fixed bridge that is anchored on implants, and both are far more stable than a removable denture. The main difference is right there in the name, the number of implants used to support that bridge. This guide walks through how the two compare across bone, stability, cost, and surgery, and why there is no single “better” answer that fits everyone.

What All-on-4 and All-on-6 actually are

Both All-on-4 and All-on-6 are full-arch implant treatments. Instead of replacing one tooth at a time, they replace every tooth in an arch with a single fixed bridge that is screwed onto dental implants placed in the jawbone. That bridge does not come out at night, it stays put like natural teeth. If you want a refresher on the basics, our overview of what dental implants are explains how the post, abutment, and restoration fit together.

The difference between the two is simply the number of implants per arch. All-on-4 uses four implants, typically two placed straight at the front of the jaw and two angled toward the back. All-on-6 uses six implants to support the full-arch bridge, adding two more anchor points along the arch. Everything else, the fixed bridge, the goal of replacing a whole arch, the fact that these are permanent, is the same.

It also helps to know that these are treatment concepts rather than a single brand of hardware. A dentist plans where the implants go, how they are angled, and how the bridge connects to them based on your jaw. That is why two people who both get “All-on-4” can end up with slightly different implant positions, and why the choice between four and six is a planning decision, not an off-the-shelf pick.

Why the number of implants matters

More implants generally means more support. Six implants distribute chewing forces across more anchor points, which can mean better stability, less strain on each individual implant, and potentially better longevity for the bridge. That extra support can be an advantage for people with heavy bite forces, and it is one reason a dentist might lean toward six for certain cases.

That said, four well-placed implants can work extremely well. The All-on-4 concept was engineered so that four implants, when planned and positioned correctly, provide enough support to carry a full arch reliably. In many cases four is genuinely enough. So the real question is not “which number is better in the abstract” but “what does this particular jaw, bite, and case need?” That is a judgment your dentist or oral surgeon makes after looking at your bone and your bite, usually with a 3D CBCT scan.

It is worth resisting the instinct that more is always safer. Every implant needs a healthy site with enough bone around it to integrate and stay stable, so adding implants only helps when there is good bone to place them in. In a jaw where bone is limited, trying to force in six implants can mean grafting, added surgery, and sites that are not ideal, whereas four implants placed in the strongest available bone may give a more predictable result. The goal is the right number in the right places, not the highest number possible.

How they compare, factor by factor

Bone requirements

This is often the deciding factor. All-on-4 was specifically designed to minimize the need for bone grafting. The angled back implants are placed to make use of the bone that is already there, which often lets the surgeon avoid procedures like a sinus lift. That makes All-on-4 a strong option for patients who have lost some bone. All-on-6 usually needs more, and adequate, bone in more positions along the arch, and it may require grafting to build up sites, in exchange for more anchorage.

Stability and strength

Six implants spread the load across more points, which can be an advantage for heavy chewers, people who grind their teeth, or the lower jaw, where bite forces are higher. Four implants still deliver a firmly fixed result, but for cases with unusually heavy forces, the extra support of six can help protect the restoration over time.

Cost

All-on-6 typically costs more, largely because it involves two additional implants and, sometimes, grafting to prepare the extra sites. All-on-4 tends to be the more cost-effective full-arch fixed solution. Prices vary widely by region, provider, and materials, so treat any figure as a starting point, our guide to full mouth dental implant cost breaks down what actually drives the number.

Surgery and recovery

Placing six implants is a bit more surgery than placing four, and any added grafting extends the process. Both are well-established procedures with high success rates in the right candidates, and both often allow “teeth in a day,” a temporary fixed bridge fitted the same day as surgery while the implants heal. After that healing period, usually several months, the temporary is replaced with a final, stronger bridge.

Longevity

Both approaches have a strong track record when the case is planned well and cared for properly. In theory, spreading the load across six implants can reduce the stress carried by each one, which some clinicians see as a longevity advantage in demanding cases. But longevity is driven by many things beyond implant count, your bite, your gum and bone health, how well you clean under the bridge, whether you grind, and whether you keep up with checkups. A well-maintained All-on-4 can last many years, just as a poorly maintained All-on-6 can run into trouble early.

Who each option tends to suit

There is no universal winner, but some patterns are common.

• All-on-4 often suits patients who have less available bone, who want to avoid grafting where possible, and who want a more cost-effective full-arch fixed solution. It works well for the upper or lower arch when four implants provide enough support for the case.
• All-on-6 often suits patients who have enough bone and want maximum stability and force distribution, people with a heavy bite or grinding habit, or cases where the dentist judges that more support will benefit the long-term result.

Notice that both lists point back to the same thing, your individual anatomy and habits. More implants are not automatically necessary, and four implants are not a compromise. The right number depends on your bone, whether it is the upper or lower jaw, your bite forces, and your surgeon’s assessment.

How All-on-4 and All-on-6 compare to dentures

Both options are a major step up from a traditional removable denture. Because the bridge is anchored on implants, it does not slip, click, or need adhesive, and it lets you bite and chew with far more confidence. If you are weighing fixed implants against a removable plate, our comparison of dental implants versus dentures covers the trade-offs in stability, bone health, maintenance, and cost. Whichever number of implants you choose, the aftercare is the same, meticulous cleaning under the bridge and regular checkups keep the gums healthy and the implants sound.

The bottom line: it depends on your case

All-on-4 and All-on-6 both replace a full arch of teeth on dental implants with a fixed, permanent bridge. Six implants give more support and stability, which can be better for heavy bites, but they usually ask for more bone and more cost. Four implants minimize grafting and cost while performing very well in many cases. The best choice is not decided by “more is better,” it is decided by your bone, your bite, and an oral surgeon’s evaluation using proper scans.

If you are considering a full-arch solution, the right next step is a consultation with a dentist or oral surgeon who can take a CBCT scan and assess your case. If you have significant bone loss, a heavy grinding habit, or a failing set of teeth you want replaced with something fixed, book an evaluation and ask specifically how many implants your case calls for and why.

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