All-on-4 vs All-on-6: Which Do You Need?

All-on-4 and All-on-6 both give you a full arch of fixed teeth on implants. The difference is not just "more implants equals better." It is about bone volume, bite force, arch length, and long-term risk. Here is the honest comparison.

The Quick Answer

All-on-4 uses 4 implants per arch — two straight at the front, two angled at the back. Developed by Nobel Biocare as the original protocol. Works even with moderate bone loss because the angled implants avoid weak areas.

All-on-6 uses 6 implants per arch — two at the front, four distributed across the middle and back. Provides more points of support but requires more bone volume.

When All-on-4 Is the Right Choice

All-on-4 was designed to solve a specific problem: giving patients fixed teeth even when they have moderate bone loss. The two angled posterior implants bypass the areas where bone is thinnest (the back of the upper jaw above the sinuses, and the back of the lower jaw near the nerve canal).

Choose All-on-4 if:

• You have been told you have moderate bone loss
• You want to avoid bone grafting or sinus lifts (the angled implants often make this unnecessary)
• You are on a budget — 4 implants costs 25-35% less than 6
• Your case is straightforward and your dentist confirms 4 implants are sufficient
• You are replacing dentures and want the most proven protocol

Clinical data: The original Nobel Biocare All-on-4 protocol has been studied for over 20 years. Published survival rates at 10 years consistently exceed 95%.

When All-on-6 Is Better

All-on-6 makes sense when you need extra support — either because of the forces on the bridge or the anatomy of your jaw.

Choose All-on-6 if:

• You grind your teeth heavily (bruxism) — 6 implants distribute the force better
• You have a wide arch — more implants prevent flexion in the bridge
• You have good bone volume — no need to limit yourself to 4
• You want maximum long-term security and your budget allows it
• Your dentist recommends it based on your CBCT scan

Note: Some clinics push All-on-6 when All-on-4 would be perfectly adequate. If your dentist recommends 6 implants, ask specifically: "What about my case makes 6 better than 4?" A good dentist will explain based on your scan, not give a generic answer.

The Bridge: What Goes on Top

The implants are the foundation. The bridge — the part you see and chew with — sits on top. Both All-on-4 and All-on-6 use the same bridge options:

Our recommendation: Zirconia bridges are now the standard for full-arch work. They are stronger than acrylic hybrids, more natural-looking, and last longer. If cost is a factor, monolithic zirconia offers the best value.

The Process: What to Expect

Same-day teeth (both protocols)

You walk in with failing teeth or dentures. You walk out with fixed temporary teeth on implants — on the same day. This is not marketing hype; it is how the protocol works.

Day 1: Consultation, final CBCT scan, treatment plan confirmed Day 2: Surgery — extractions (if needed), implants placed, temporary bridge fitted Day 3-5: Recovery, soft food, follow-up checks Fly home: Day 5-7

Healing period (3-6 months)

The temporary bridge stays in place while the implants integrate with the bone. You can eat, talk, and smile normally — just stick to softer foods for the first 2-4 weeks.

Final bridge (return trip, 3-5 days)

Once healing is confirmed by X-ray, impressions are taken for the final zirconia bridge. This is fitted, adjusted, and polished during a second trip of 3-5 days.

Real Cost Comparison for UK Patients

Example: Both arches (upper and lower), All-on-4, zirconia bridges:

Saving: £7,000-£20,000 depending on destination and UK quote.

Rather than working with ranges, the savings calculator below uses real prices from our verified clinics. Select All-on-4 or All-on-6 and see exact numbers.

Red Flags to Watch For

1. "All-on-4 in 3 days" — The surgery takes one day. Rushing means fewer checks, less planning, and higher risk of complications.
2. No CBCT scan — Any clinic placing implants without a 3D scan is guessing where the bone is. This is non-negotiable.
3. Unnamed implant brand — "We use premium implants" is not an answer. You need Straumann, Nobel Biocare, MIS, or MegaGen — with the certificate to prove it.
4. No night-guard — Bruxism is the #1 cause of implant failure in full-arch cases. If the clinic does not include a night-guard, ask why.

Not Sure Which You Need?

The answer depends on your CBCT scan — specifically, your bone volume, arch width, and whether you grind your teeth. Tell Pearl AI below what your situation is and she will help you understand which option makes sense for your case. Or take the 2-minute dental health check for a personalised recommendation.

Can I get All-on-4 on just one arch?

Yes. Many patients only need one arch replaced — usually the upper. The other arch may be healthy or treatable with individual crowns. Your CBCT scan will show what each arch needs.

Is All-on-6 worth the extra cost?

If your dentist specifically recommends it based on your bone scan and bite analysis, yes. If they are recommending it generically without explaining why, get a second opinion. For 80% of patients, All-on-4 is sufficient.

What implant brand should I ask for?

Nobel Biocare is the original All-on-4 system and has the longest clinical track record. Straumann is equally respected. MIS and MegaGen are reliable and more affordable. Avoid clinics that cannot name the brand — if they will not tell you, there is a reason.

How long do All-on-4 implants last?

The implants themselves: 20-25+ years (often a lifetime with proper maintenance). The bridge on top: 15-20 years for zirconia, 10-15 for hybrid acrylic. You will likely need one bridge replacement over a lifetime.