All-on-4 vs. All-on-6: the core difference
Both All-on-4 and All-on-6 replace a full arch of missing or failing teeth with a single fixed, non-removable bridge: no adhesives, no taking the teeth out at night. The difference, as the names suggest, is the number of implants used to anchor that bridge: four for All-on-4, six for All-on-6 (sometimes grouped more broadly under the term All-on-X).
That single number changes several things: how the load of chewing is distributed, how much bone is required, and in some cases how the treatment plan is sequenced. Neither protocol is universally "better": the right one depends on your bone volume, your goals, and what a 3D scan of your jaw actually shows.
How All-on-4 works
All-on-4 anchors a complete, fixed bridge using just four implants: two placed straight at the front of the jaw and two angled at the back, where bone is typically densest. That angled placement spreads the chewing load efficiently and very often avoids the need for a bone graft, even in patients who have been told they have too little bone for implants.
Because it uses fewer implants and frequently sidesteps bone grafting, All-on-4 is often the protocol that allows qualifying patients to leave with a fixed temporary bridge the same day as surgery (immediate load).
How All-on-6 works
All-on-6 uses the same core concept (a fixed bridge anchored to implants placed strategically along the arch) but adds two more implants for extra support. This distributes the biting force across more points of contact, which can be an advantage for patients with higher bite forces, a longer-span bridge, or bone conditions that support additional implants.
Because it relies on more implants, All-on-6 generally requires more available bone volume across the arch than All-on-4. When a patient does not have enough bone in additional sites, a bone graft may be recommended to create a stronger foundation before six implants can be placed.
Which protocol fits which patient?
All-on-4 tends to be recommended when bone volume is more limited, when a same-day fixed result is a priority, or when a patient wants to minimize the number of implant sites and any associated grafting. It has become a widely used solution specifically because its angled design works well even after years of bone loss from missing teeth or long-term denture wear.
All-on-6 tends to be recommended when a patient has good bone volume across the arch and their dentist determines that additional support will benefit the long-term outcome, for example, in patients who clench or grind heavily, or when the treatment plan calls for a longer bridge span. The extra implants can also serve as a safety margin: if one implant were ever to need attention down the road, the bridge has more points of support overall.
Only a hands-on exam and a 3D scan of your jaw can determine which protocol fits your specific bone structure and goals: this is exactly what happens at a free implant evaluation.
What to expect: the process for both
Both protocols follow a similar overall sequence. It starts with a free evaluation and a 3D scan, which maps your bone in detail and allows your dentist to plan the exact number, position, and angle of implants your case needs. On surgery day, the implants are placed, and for qualifying patients, a fixed temporary bridge is attached the same day so you leave with a functional set of teeth.
After a healing period, during which osseointegration occurs, the process by which the titanium implants fuse with the surrounding jawbone, your final, custom-milled bridge is fabricated and fitted. Because Dental Fitness has its own in-house lab, this final restoration is designed and adjusted under our own quality control for a precise, natural-looking result, whether your case used four implants or six.
Comparing full-arch options: All-on-4, All-on-6 and snap-on dentures
It helps to see the full spectrum of full-arch options side by side. A snap-on (implant-supported) overdenture clips onto two to four implants and is removable for cleaning: a more economical option that offers meaningfully more stability than a traditional denture, but less than a fixed bridge, since it still comes out at night.
All-on-4 and All-on-6 both deliver a fixed, non-removable result that functions and feels closest to natural teeth, with the choice between them coming down to bone volume, bite forces, and your dentist's recommendation after reviewing your 3D scan.
Are you a candidate for full-arch implants?
Most healthy adults missing most or all of the teeth in an arch (whether from advanced decay, gum disease, or long-term denture wear) are candidates for one of these full-arch protocols. What matters most is bone volume (which a 3D scan will show precisely), healthy gums free of active infection, and reasonably well-managed overall health, since conditions like uncontrolled diabetes can affect healing.
Smoking can also affect healing and long-term success, so if you smoke, your dentist will discuss how to minimize the impact on your outcome. None of these factors automatically rule out treatment; they simply help determine which protocol, and whether any bone grafting, fits your case.
Financing full-arch treatment
Full-arch treatment, whether All-on-4 or All-on-6, is a larger investment than a single implant, but it is frequently more cost-effective than replacing many individual teeth one at a time, and it delivers a permanent, fixed result. We accept most insurances and verify your benefits for free, and we offer flexible financing plans for everyone, with 0% interest options available for qualified patients. Your exact, written quote comes at your free evaluation, never a phone estimate. Learn more about the options on our full-arch and All-on-4 page, or read about single and multiple implants if you are still deciding whether a full-arch solution is right for you.
Caring for a full-arch bridge, whichever protocol you choose
Day to day, both All-on-4 and All-on-6 are cared for like natural teeth: brushing and flossing (often with the help of a water flosser to clean around and under the bridge) and regular checkups so your dentist can confirm everything remains stable. Because the bridge is fixed in place rather than removable, there is no soaking, no adhesive, and nothing to take out at night.
Routine checkups matter for full-arch implants specifically because they allow your dentist to catch small issues, such as a loose screw or a minor bite adjustment, before they become bigger problems: the same principle behind any long-term dental investment.
Frequently asked questions
Can I switch from All-on-4 to All-on-6 later, or vice versa? Your treatment plan is determined before surgery based on your 3D scan, so the protocol is chosen upfront rather than changed mid-treatment. If your bone changes significantly over many years, your dentist can reassess your options at that time.
Does All-on-6 always require a bone graft? Not necessarily: it depends on your existing bone volume across all six implant sites. Some patients have enough natural bone; others may benefit from grafting first. Your 3D scan will show exactly where you stand.
Is All-on-6 more expensive than All-on-4? Generally, yes, since it involves two additional implants and, in some cases, additional bone grafting. Your free evaluation will give you an exact, written comparison for your specific case.
How long do full-arch implants last? The implants themselves are designed to be permanent, and with good hygiene and routine checkups can last for decades, with implant success rates exceeding 95%. The fixed bridge on top is built to last many years before it may need refreshing.
Do I need to treat both arches, or can I do just one? Many patients only need full-arch treatment on the upper or lower arch, while the other arch may only need a single implant, a few implants, or no treatment at all. Your 3D scan and evaluation will clarify exactly what your case requires.
Does the number of implants affect how natural the result looks? No, whether your bridge is anchored on four or six implants, the visible result is the same custom-milled bridge, designed and fitted to match your face and bite. The implant count is a structural decision beneath the surface, made for stability and bone support, not something that changes the final appearance you and others actually see day to day.
What happens during the healing period between surgery and the final bridge? You wear a fixed temporary bridge (for qualifying patients) while osseointegration occurs beneath it, so you are never without teeth during this phase. Your dentist will schedule check-ins to confirm healing is progressing as expected before your final, custom-milled bridge is fabricated and fitted.