All-on-4 vs All-on-6: Which Full-Arch Implant Solution Is Right for You?

All-on-4 and All-on-6 are both techniques for replacing a full arch of teeth with a fixed bridge supported by dental implants. The core difference is in the name: All-on-4 uses four implants per arch, All-on-6 uses six. More implants can mean greater stability and better load distribution, but also a higher cost and, sometimes, greater bone requirements.

Quick answer: Choose All-on-4 for a cost-effective, widely-suitable fixed full arch — often possible even with some bone loss. Choose All-on-6 when you want maximum stability and load distribution and have sufficient bone. The right option is confirmed by a clinical assessment.

All-on-4 vs All-on-6 at a glance

	All-on-4	All-on-6
Implants per arch	4	6
Stability	Excellent for most patients	Maximum load distribution
Bone requirement	Often works with some bone loss	Generally needs more bone
Cost in Romania (from)	£3,500/arch	£4,800/arch
Cost in UK (from)	£13,000/arch	£14,500/arch
Typical use	Cost-effective full-arch restoration	Heavier bite forces / extra security

How does All-on-4 work?

Four implants are placed per arch — typically two straight at the front and two angled at the back to make the most of available bone. A fixed bridge is secured to them. Because the angled placement often avoids the need for grafting, All-on-4 is suitable for a wide range of patients, including many with some bone loss.

How does All-on-6 work?

Six implants spread the biting load across more anchor points, which can offer extra stability and redundancy. It generally requires more healthy bone, which is why a scan and assessment determine whether it's appropriate for you.

Which one should you choose?

• Budget and broad suitability: All-on-4 delivers a fixed, natural-looking arch at a lower cost and works for most patients.
• Maximum stability: All-on-6 may be recommended where bite forces are higher or extra security is desired, and where bone allows.
• The deciding factor is clinical. Your bone volume, bite and goals — assessed from a scan — determine the best option. A good clinic will recommend the appropriate solution, not simply the most expensive one.

Recovery and timeline

Full-arch cases usually involve two shorter trips a few months apart: placement first, then the final fixed bridge once the implants have integrated. A temporary set of teeth is typically provided in between, so you're never without a smile.

Frequently asked questions

Is All-on-6 better than All-on-4? Not automatically. All-on-6 can offer more stability and load distribution, but All-on-4 is highly effective and suitable for more patients. "Better" depends on your bone, bite and budget.

How much can I save versus the UK? Full-arch work is where savings are largest in absolute terms — often £9,000–£11,000 per arch compared with UK private fees.

How long do full-arch implants last? With good care they're designed to last many years; reputable clinics provide warranties of up to 5 years on implants, recognised EU-wide.

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