Does All-on-4 mean I only get 4 teeth?

No, All-on-4 refers to the number of implants supporting the arch, not the number of teeth. The finished result is a complete, full arch of replacement teeth.

Can All-on-4 replace both the top and bottom arches?

Yes, it can be done on one arch or both, depending on which teeth need replacing and what your exam shows.

Is All-on-4 removable like a denture?

No, it's a fixed prosthetic attached to the implants, so it doesn't come out the way a traditional removable denture does.

How Many Teeth Does All-on-4 Replace?

how many teeth can all-on-4 actually replace?

By Dr. Aakash Rana, DDS · Updated September 2026 · 5 min read

Short answer: All-on-4 replaces an entire arch of teeth, every tooth on the top or bottom, using just 4 strategically placed implants to support one fixed prosthetic.

The name "All-on-4" trips people up more than any other implant term, it sounds like it might replace 4 teeth, but it actually does something much bigger than that. Here's what All-on-4 really covers, who it's designed for, and how it compares to replacing teeth one at a time. Understanding the name is often the first step toward understanding whether the treatment itself is the right fit for you.

The Short Answer: An Entire Arch, Not Just 4 Teeth

All-on-4 replaces a full arch, meaning every tooth across the top or the bottom of your mouth, with one fixed, full-arch prosthetic supported by just 4 dental implants placed strategically along the jaw. The "4" in the name refers to the number of implants used to anchor that entire arch, not the number of teeth being replaced, which is where most of the confusion comes from. In practice, that means patients missing most or all of their teeth on top, bottom, or both can be treated with a complete new arch of fixed, functional teeth in one coordinated plan. The finished result typically includes a full set of teeth across the arch, not a partial one, so nothing about your smile looks incomplete once treatment is done.

Why 4 Implants Can Support a Full Arch

The 4 implants in an All-on-4 arch aren't placed randomly, they're positioned at specific angles to take advantage of the strongest, densest bone naturally available in the jaw, often angling the back implants forward to avoid areas where bone has thinned over the years. This positioning is what allows a relatively small number of implants to securely support an entire arch of replacement teeth, rather than needing one implant for every single missing tooth, which would be a much larger and more invasive undertaking. It's also why some patients who've been told they don't have enough bone for individual implants are still able to move forward with All-on-4.

Who's a Good Fit for All-on-4

All-on-4 is generally designed for patients who are missing most or all of their teeth in an arch, whether due to advanced decay, gum disease, old and failing dentures, or some combination of these over the years. It's also frequently used for patients who are currently wearing a removable denture and want a fixed alternative that doesn't come out, click, or require adhesive. Whether it's the right fit for you depends on your bone structure and overall oral health, which is assessed carefully at your exam before any plan is finalized.

All-on-4 vs. Replacing Each Tooth Individually

For a patient missing most of an arch, placing one implant for every missing tooth would mean far more surgical sites, more healing time, and considerably more cost than most people need. All-on-4 was developed specifically to avoid that, using a smaller number of implants, positioned to take advantage of the bone that's actually available, to support a complete arch. That's different from a patient missing just one or two teeth, where a single implant per gap usually still makes the most sense. Which approach fits depends entirely on how many teeth need replacing and the condition of the ones you have left, which is exactly what your exam is designed to determine.

Top, Bottom, or Both

All-on-4 can be done on the upper arch, the lower arch, or both at the same time if needed, depending on which teeth need replacing and your overall treatment goals. Patients treating both arches go through the same core process on each side, and Dr. Rana will walk you through the specific plan for your mouth, including timeline, sequencing, and what to expect at each stage, during your consult. Some patients choose to treat one arch first and revisit the other later, while others prefer to complete both in a single coordinated plan, either approach can work depending on your preferences and your bite.

What's Included at Prana

Full-arch treatment at Prana starts from $9,999 per arch, includes a 5-year workmanship guarantee, and your final teeth are designed and milled in our in-house dental lab rather than outsourced to an outside facility. 0% financing is available from $167/month for qualified patients on approved credit, and your free consult includes X-rays or a 3D scan so you know exactly what your treatment would involve before deciding anything at all. Most major insurance is accepted as well, and your exact coverage is confirmed in writing before you commit to a plan.