All-on-4 vs All-on-6: Which Full-Arch Solution Fits Your Case?

If you've lost most or all the teeth on one or both arches, you have two real options for a fixed (non-removable) replacement: All-on-4 or All-on-6. The names refer to the number of titanium implants we place per arch to support a full bridge.

Both work. Both are durable. The choice between them comes down to three factors: how much bone you have, how heavy your bite is, and your budget.

The short version

All-on-4 uses 4 implants per arch, angled at the back to maximize bone contact in the front of the jaw. The bridge sits on top, with all 12 to 14 teeth on it. Cost: from $8,500 per arch in our Medellín clinic.

All-on-6 uses 6 implants per arch, with two extra in the posterior. Distributes chewing force across more anchor points. Cost: from $11,500 per arch.

For most patients with normal bone density and a non-grinder bite, All-on-4 is the right call. For patients with strong bone, a heavy bite, or who plan to chew on the back teeth heavily (steaks, chewy bread), All-on-6 is the safer long-term bet.

Cost comparison

Solution	Colombia (per arch)	USA (per arch)	You save
All-on-4	$8,500	$25,000 to $50,000	~75%
All-on-6	$11,500	$30,000 to $60,000	~75%
All-on-4 (both arches)	$17,000	$50,000 to $100,000	~75%
All-on-6 (both arches)	$23,000	$60,000 to $120,000	~75%

The price difference between All-on-4 and All-on-6 in Colombia is $3,000 per arch ($6,000 for a full mouth case). For comparison, the US delta is $5,000 to $10,000 per arch. The cost of "upgrading" from All-on-4 to All-on-6 is therefore much smaller in Colombia, which is why we lean toward recommending All-on-6 for any patient who isn't bone-constrained.

Why two extra implants matter (and why they sometimes don't)

The All-on-4 protocol was developed in the 1990s by Paulo Maló in Portugal. The breakthrough insight was that 4 implants, with the back two angled forward at 30 to 45 degrees, can stably support a full-arch bridge by maximizing bone contact in the dense anterior bone of the jaw. The angled placement avoids the sinus cavity in the upper jaw and the inferior alveolar nerve in the lower jaw.

For most patients, that's enough. The 4 implants distribute force adequately, the bridge is stable, and the load on each implant is within tolerance.

For some patients, four isn't enough:

Heavy bite force. A strong bite or bruxism puts more load on each anchor point. With six implants, force is spread across 50% more posts.
Posterior chewing emphasis. If you chew heavily on the back teeth (steak-eaters, athletes who eat large protein loads), the cantilever section of an All-on-4 bridge takes more force than designed.
Uneven bone. If bone density is good in some places and weaker in others, six implants gives you more options for placement.
Long-term insurance. Implants don't usually fail in the first decade; failures appear at 15 to 20 years if they're going to. Six implants gives you a redundancy buffer if one fails late.

For other patients, six is unnecessary:

Limited bone in the posterior. If the back of the jaw is too thin for two extra implants without a sinus lift or major bone graft, the cost and complexity of All-on-6 outpaces the benefit.
Tight budget. $3,000 per arch saved on All-on-4 can fund flights, hotel, and the trip itself.
Single-arch only with normal bite. If you're only doing one arch and your bite isn't heavy, the All-on-4 protocol has 30 years of clinical track record.

Want a precise quote?

Send a panoramic X-ray, we'll tell you which protocol fits

The decision between four and six implants is largely a CBCT/panoramic question. If you have a recent scan, we can give you a confident recommendation in 24 hours.

Get a Free Treatment Plan

Bone: the single biggest factor

Both protocols need bone to anchor the implants. The CBCT 3D scan we do on Day 1 of Trip 1 measures bone density and depth at every potential implant site. From that scan, we know:

Whether All-on-4 is feasible without a graft (most cases)
Whether All-on-6 is feasible without a graft (about 60% of cases)
Whether either requires a sinus lift or bone augmentation

For about 30 to 40% of full-arch cases, we end up needing some form of bone augmentation. We quote that upfront in the treatment plan, never add it later. Common scenarios:

Bone graft ($450 per site): localized augmentation where bone is too thin for an implant
Sinus lift ($500): in upper-arch cases where the sinus floor is too low

If bone augmentation is needed, the procedure adds 4 to 6 weeks of healing time before we can place the implant on top. For All-on-6, this can mean staging the placement: front 4 placed first, back 2 placed at month 2 or 3 once the graft has matured.

Bite: heavy chewers go to six

The simplest test: do you grind at night, or have you cracked a tooth in the past five years? If yes, lean toward All-on-6.

Other heavy-bite signals we look for:

Strong masseter (jaw) muscles visible from the side profile
Wear facets on natural canines and molars
A history of broken fillings, crowns, or veneers
Reports from a partner that you grind in your sleep

For these patients, All-on-6 is cheaper insurance than dealing with a failed All-on-4 in year 12.

Cosmetics: identical

Both protocols use the same final teeth. We mill the bridge in our in-house lab from monolithic ZirCAD Prime zirconia, the same brand line as our veneers and crowns. Hand-glazed for shade and translucency.

From the outside, no one can tell whether you have 4 implants or 6 underneath. The teeth are the teeth.

The cosmetic result is identical between All-on-4 and All-on-6. The difference is what happens underneath, over the next 15 to 20 years.

Procedure: identical from the patient's side

For both protocols:

Trip 1 (3 to 5 days): CBCT scan, surgical placement under local anaesthetic, optional bone graft or sinus lift, immediate temporary bridge fitted same-day where the case allows. You fly home with a working temporary smile.
Healing window (4 to 6 months at home): Osseointegration. Soft food for the first two weeks, normal diet by month two. WhatsApp check-ins at week 1, month 1, and month 3.
Trip 2 (3 to 5 days): Healing check, abutment placement, scans for the final bridge. Lab fabricates over a few days. Try-in and bonding before you fly home.
Trip 3 (2 to 3 days, around month 12): For All-on-4 and All-on-6, we typically do a final fitting visit a few months after Trip 2 to fine-tune the bite under load.

Total time: 12 months from start to final fitting. Total in-clinic time: roughly 8 to 10 days across the three trips.

What we recommend during the consult

After reviewing photos, X-rays, and a brief history (do you grind, have you broken teeth, what's your daily bite stress), we send back:

Recommended protocol (4 vs 6)
Whether bone augmentation is likely needed
Total cost (all-in: implants, abutments, bridge, surgical fees, anaesthetic, lab work)
Target trip dates
Lifetime expectation (15 to 20+ years for the bridge, lifetime for the titanium posts)

We don't push the more expensive option. About 60% of our All-on-X cases are All-on-4. The other 40% are All-on-6, mostly grinders or patients with strong posterior chewing patterns.

What about All-on-8?

Some clinics offer All-on-8. We don't, and we don't recommend it for most cases. The clinical evidence for adding two more implants beyond six is weak; the cost is significantly higher; and the increased number of placements compounds surgical risk. Six implants per arch is the upper bound where the cost-benefit math holds.

If a clinic is recommending All-on-8 for a case that doesn't have very specific bone or bite indications, get a second opinion.

Next step

Send your photos and any recent X-rays to us on WhatsApp. Within 24 hours we'll send back a personalized treatment plan with the protocol recommendation, total cost, expected bone work, and target trip dates. Free, no obligation.

If you don't have X-rays yet, no problem. We can quote a likely range from photos and refine on Day 1 of Trip 1 once we have the CBCT scan.