All-on-4 Dental Implants
All-on-4 is a technique for replacing a full row of missing or failing teeth with a fixed (non-removable) bridge, supported by just four implants per arch — two placed straight at the front and two angled toward the back. The angled placement uses the denser bone naturally available at the front of the jaw, which is why All-on-4 can often avoid the bone grafting that individual implants in the back of the mouth sometimes need.
What All-on-4 Is and Who It Suits
All-on-4 is designed for patients who are missing most or all of their teeth in one or both jaws, or whose remaining teeth are too damaged or loosened by gum disease to save. Rather than replacing each tooth with its own implant, four implants per arch anchor a full fixed bridge — a solution some patients prefer over removable dentures because it doesn’t rely on suction or adhesive and functions closer to natural teeth.
It particularly suits people who want to avoid the removable nature of traditional dentures, and who don’t have enough bone volume throughout the jaw for a full set of individual implants but do have adequate bone in the specific front-of-jaw positions the technique relies on.
How All-on-4 Works, Step by Step
- Consultation and 3D imaging. A CBCT scan maps bone volume, density, and the position of the sinuses and nerves, which determines exact implant angles and positions.
- Extraction, if needed. Any remaining unsalvageable teeth in the arch are removed, often on the same day as implant placement.
- Implant placement. Four implants are placed per arch — two vertical at the front, two angled at the back — under local anaesthesia (sometimes combined with sedation; see /treatments/oral-surgery/ for what that involves).
- Temporary bridge. Where bone quality allows enough initial stability, a temporary fixed bridge can sometimes be attached soon after surgery so the patient isn’t left without teeth during healing. Whether this “same-day” step is possible depends on the individual case — it is not guaranteed for every patient.
- Healing period. The implants integrate with the bone over a period of months before the final bridge is made.
- Final bridge fitted. A permanent, custom-fabricated bridge replaces the temporary one once healing is confirmed.
How Many Visits and How Long It Takes
All-on-4 involves a planning visit, a surgical day, a temporary-bridge stage (where applicable), follow-up visits during healing, and a final delivery visit — realistically five or more appointments spread across several months. Healing before the definitive bridge is fitted commonly falls in a three-to-six-month range, similar to individual implants, though this depends on bone quality and how the implants integrate for a given patient. Treat this as a general planning range, not a fixed date — your dentist will confirm timing based on how your own healing progresses.
All-on-4 vs. All-on-6, and Other Variants
All-on-4 and All-on-6 solve the same problem — replacing a full arch with a fixed bridge — but differ in how many implants support the bridge. All-on-6 is often considered when more bone is available or when the dentist judges extra implants will better distribute biting force over the long term; All-on-4 is designed specifically to work with less bone by angling the posterior implants. Which is more suitable is a case-by-case decision based on the 3D scan, not a matter of one being universally “better.”
The final bridge itself can also vary in material — options generally include an acrylic-and-metal hybrid or a zirconia framework, each with different trade-offs in strength, appearance, and long-term maintenance. Loading protocol is another variant: some cases proceed with a temporary bridge attached soon after surgery (often called “immediate loading”), while others require a longer healing period before any bridge, temporary or final, is placed — this depends entirely on the stability achieved at the time of surgery.
Not sure whether this applies to your teeth?
The only way to know is an examination. Ask a question first if you would rather understand the options before booking anything.
Contraindications and Limitations
All-on-4 is major treatment, and it isn’t right for every patient missing a full arch of teeth:
- Insufficient primary stability at surgery — if the implants can’t be placed firmly enough at the time of surgery, immediate loading with a temporary bridge isn’t possible and a longer healing period is needed instead.
- Uncontrolled diabetes or other conditions that impair healing.
- Heavy smoking, which measurably reduces implant integration success.
- Active oral infection, which needs to be resolved before implants are placed.
- Severe bruxism (teeth grinding) without a management plan, which places extra stress on a full-arch bridge.
A full medical and dental history review during consultation is how individual suitability is actually determined — this list is general guidance, not a substitute for that assessment.
Caring for an All-on-4 Bridge After Treatment
Immediately after surgery, a soft diet is typically recommended for a period while the implants begin to integrate, along with avoiding smoking and following any medication prescribed. Because the bridge is fixed rather than removable, cleaning underneath it requires specific tools — interdental brushes or a water flosser designed to clean around a fixed prosthesis — which your dentist will show you how to use.
Long term, a fixed full-arch bridge needs the same regular check-ups as natural teeth, so the dentist can monitor the implants, the gum tissue around them, and the bridge itself, and address any wear or maintenance needs as they come up.
Frequently asked questions
All-on-4 vs. All-on-6 — which one do I need?
It depends on your bone volume and bite, not personal preference alone. All-on-4’s angled back implants are designed to work with less available bone, while All-on-6 is often chosen when more bone is present or extra support is judged beneficial. A 3D scan and consultation is how this is actually decided for your case.
Is All-on-4 done in one day?
Sometimes a temporary fixed bridge can be attached soon after surgery, but this depends on achieving enough implant stability during placement — it isn’t guaranteed for every patient, and a longer healing period before any bridge is fitted is sometimes the safer choice for a given case.
How long does an All-on-4 bridge last?
Long-term durability depends on oral hygiene, bite forces, and regular maintenance visits, and it varies by patient — there’s no fixed lifespan that applies to everyone. Your dentist can give you a more specific outlook based on your bone quality, bite, and habits like grinding.
Can I eat normally after All-on-4?
Not immediately. A soft-food period is standard while the implants begin to integrate. Once the final bridge is fitted and healing is confirmed, most patients can return to a fairly normal diet, though very hard or sticky foods may still be discouraged to protect the bridge.
What if I don't have enough bone for All-on-4?
All-on-4 is specifically designed to work with less bone than individual implants require, by angling the back implants into denser bone. If bone volume is still insufficient even for this approach, bone grafting or All-on-6 may be discussed as alternatives during consultation.
How can I tell if an All-on-4 provider is reputable?
Look for a dentist who reviews your 3D scan with you, explains the specific implant plan for your bone anatomy, discusses risks and limitations honestly rather than promising guaranteed outcomes, and is clear about who actually performs the surgical stage of treatment.
Questions about this treatment?
Every case is different. The most useful first step is an examination, where the options for your teeth can be explained in person.