Four implants or six? On paper, it sounds simple: six is a bigger number, so it’s tempting to assume it must be the stronger option. It isn’t that straightforward, and choosing based on the number alone is one of the most common mistakes we see patients make before they’ve even had a scan.
All-on-4 dental implants and All-on-6 are both ways of supporting a full arch of replacement teeth. But the real difference isn’t the count, it’s implant position, available bone, your bite, and how the final teeth are designed to work together. We don’t fit a patient into a package. We work out what their jaw can actually support.
All-on-4 vs All-on-6 at a Glance
| All-on-4 | All-on-6 | |
| Number of implants | Four | Six |
| Bone requirement | Works with reduced bone volume | Generally needs more available bone |
| Positioning | Two upright at front, two angled at back | Mostly upright, spread across the arch |
| Grafting | Often avoided through angled placement | Sometimes still needed |
| Cost | Generally lower | Generally higher |
| Best suited for | Patients with thinner or reduced jawbone | Patients with strong, well-preserved bone |
The table gives you the basics. The reasoning behind it is what actually decides your case.
What Are All-on-4 Dental Implants?
All-on-4 dental implants use four implants placed at specific angles, two straight at the front, two tilted further back to reach bone that’s still usable even where height and density have reduced. That angling is the whole point. It’s what lets All-on-4 dental implants work without bone grafting in cases where a straight implant wouldn’t have enough to anchor into.
Four implants can absolutely be enough for a full, fixed arch in the right case. That doesn’t make it the right choice for every case.
What’s Different About All-on-6?
All-on-6 uses the same principle with two more implants added, generally placed upright rather than angled. Those extra implants spread the biting load across six points instead of four.
More implants can sound like an automatic upgrade. It isn’t. There has to be suitable bone in the right positions for all six, and they need to work with your bite and the planned restoration. All-on-6 is not simply All-on-4 with extra insurance built in.
Does Six Implants Mean More Stability?
Not automatically. The number of implants is one factor among several: where they’re placed, how much bone is actually there, your bite, and the design of the replacement teeth all matter just as much.
Adding two more points of support doesn’t strengthen the result if those points can’t be placed properly. That’s why we wouldn’t recommend All-on-6 just because six sounds safer, and we wouldn’t recommend All-on-4 dental implants just because fewer implants sound simpler.
Why Bone Density Makes the Decision, Not Preference
This is where most confusion starts. Your jawbone changes after teeth are lost, and how much it changes depends on how long the teeth have been missing and your general oral health. Bone density can also differ between areas of the same jaw, and even between your upper and lower arch.
With All-on-4 dental implants, the four implants are angled specifically to use the bone that’s actually available, which is why this approach often works where six implants wouldn’t fit safely without grafting first. With All-on-6, we still need six suitable positions, not just four.
A 3D scan is what tells us this. It shows bone height, width, and density beneath the gum, in the exact spots implants would go- information no visual exam can give us.
Is All-on-4 Cheaper Than All-on-6?
Usually, yes, partly because it uses fewer implants and often avoids grafting. But the total cost isn’t just about implant count; the type of restoration, any preparatory treatment, and additional procedures all factor in. We’d rather walk you through exactly what’s included in your specific plan than compare two prices without context.
Can You Just Choose the One You Want?
You can tell us what you’ve researched in Leamington Spa and what you’re hoping for. But the treatment plan should follow the assessment, not the other way round. If you’ve read about All-on-4 dental implants and think they sound right, it’s worth asking us why four implants would actually suit your jaw specifically. The same goes for All-on-6.
So Which One Is Better?
Neither, universally. All-on-4 dental implants may be the right call for one patient, while another genuinely needs six. Occasionally, further treatment is needed before either option is realistic.
At Andrew Lee Dental Practice, we scan before we discuss options, so the plan is built around what’s actually in your jaw rather than a number you liked the sound of. If you’re weighing up All-on-4 against All-on-6, the real question isn’t “which one has more implants.” It’s “which one fits my mouth, and why”, and that’s exactly what a proper assessment is for.
