You have lost most or all of your teeth on one jaw, and you keep seeing All-on-4, All-on-6, and All-on-8 in your research. The numbers blur together, and no one explains what the choice actually means for you.
All-on-X is a full-arch implant method. It replaces a whole row of teeth with a fixed bridge anchored on a set number of implants. The X stands for that number, usually four, six, or eight per arch. More implants spread your bite force wider. They also add backup. But they need more bone. Your CT scan, not the bigger number, decides what fits your jaw.
At Fifth Avenue Dental Arts in Downtown San Diego, Dr. Ramin Ghassemi, DDS, MS brings 33 years of experience in periodontology and implantology to these cases. He uses cone beam CT and 3D imaging to map your bone before anyone talks about implant counts, so the plan matches your anatomy.
What to know before you compare the options
- All-on-X replaces a full arch with a fixed bridge on 4, 6, or 8 implants.
- More implants spread bite force wider and add a backup post, but need more bone.
- All three take about 3 to 6 months from surgery to the final teeth.
- You leave surgery day with temporary fixed teeth, not empty gums.
- A CT scan of your jaw, not the marketing number, decides which option fits.
What does All-on-X actually mean?
All-on-X is an umbrella name for full-arch implant treatment, where X is the number of implants used. A dentist places that set of implants in your jaw. Then the dentist anchors a full bridge of 10 to 14 teeth on top. The result is a fixed set of teeth you do not remove, unlike a denture that snaps out.
The idea works because implants transfer chewing force into the jawbone, the way natural tooth roots do. That force keeps the bone stimulated. A denture rests on the gum and gives no such signal, so the ridge slowly shrinks. All-on-X aims to restore a full arch with one surgery and a stable bite.
All-on-4, the four-implant approach
All-on-4 uses four implants per arch. Two go in straight at the front, where the bone is usually denser. Two tilt back to reach solid bone. This avoids the sinus and the nerve. That angled design often skips the need for a bone graft, which shortens both cost and healing time.
Four implants form a stable base for most patients with decent front-jaw bone. The main trade-off is a longer span between supports and less backup if one implant struggles. For a patient with moderate bone loss and no heavy grinding habit, All-on-4 usually does the job well.
All-on-6, the six-implant approach
All-on-6 uses six implants, adding two posts in the mid-arch between the front and back. Those extra anchors spread chewing force more evenly. They also add backup. Five posts still hold the bridge if one fails to integrate. The catch is that six sites need more healthy bone than four.
This option suits patients with uneven bone, heavier bite forces, or those who grind. A 2023 finite element study in the Journal of Indian Society of Periodontology found six implants showed lower stress on bone and posts than four across several loading directions. That does not make six right for everyone, only for the anatomy that calls for it.
When is All-on-8 the right call?
All-on-8 uses eight implants for the widest force distribution and the most backup. It is not a default upgrade. Dentists reserve it for specific cases. Think very wide arches, very heavy bite forces, or medical factors that make extra support wise. For most patients, eight implants add cost and surgery time without added benefit.
Surgery runs longer with eight sites, and the option needs enough bone in all eight spots. If your jaw and bite do not call for it, six or even four can give a comparable long-term result. The goal is the right number for your mouth, not the highest number available.
All-on-4 vs All-on-6 vs All-on-8, side by side
The table sums up the differences patients ask about most. Cost ranges reflect general 2026 national benchmarks per arch, not a quote from this practice, and every plan depends on your own bone and needs.
| Factor | All-on-4 | All-on-6 | All-on-8 |
|---|---|---|---|
| Implants per arch | 4 | 6 | 8 |
| Bite force spread | Good | Better | Widest |
| Backup if one fails | Lower | Higher | Highest |
| Bone needed | Least | More | Most |
| Bone graft odds | Often avoided | Sometimes | More likely |
| Typical cost per arch | $15,000-$28,000 | $24,000-$38,000 | $28,000-$38,000+ |
| Best suited to | Moderate bone, standard bite | Uneven bone, heavy bite | Wide arch, very heavy bite |
How much does All-on-X cost, and does insurance help?
Full-arch implants are a major investment. National 2026 data puts a single All-on-4 arch near $15,000 to $28,000. All-on-6 and All-on-8 run higher, as more implants and lab work add up. Material matters too: an acrylic bridge costs less than milled zirconia, which resists wear and stain for several thousand more.
Insurance help is usually limited, since many plans classify full-arch implants as cosmetic. Ask your dental office for an all-inclusive price in writing, and confirm it covers extractions, sedation, and the final bridge, not just the temporary one. At Fifth Avenue Dental Arts, CareCredit financing and the in-house Smile Savings Membership can help manage the cost.
What does recovery look like?
All three options follow a similar timeline. You leave surgery day with temporary fixed teeth. You eat soft foods for the first weeks. The implants then fuse to the bone over 3 to 6 months. Once that bonding finishes, your dentist attaches the permanent bridge. More implants add some chair time and can bring slightly more swelling.
Desk workers usually return to work in a few days, while physical jobs need a week or more. Titanium posts can last for decades once they integrate, and the visible bridge often needs refurbishing after 15 to 20 years. Good home care and regular cleanings protect whichever option you choose.
Which All-on-X option is right for you in San Diego?
The honest answer is that your jaw decides, not a chart online. A cone beam CT scan shows your bone density, sinus position, and nerve pathways. That image is the only reliable way to know whether four, six, or eight implants suit your case. Internet research cannot replace it.
At Fifth Avenue Dental Arts, your Downtown San Diego Dentist reviews your scan with you, shows where implants would sit, and explains the reasoning behind the plan. Our office sits at 450 A St #300 in Downtown San Diego, easy to reach from Little Italy, the Gaslamp Quarter, and East Village. Sedation options keep a longer surgery comfortable for anxious patients.
If full-arch implants have been on your mind, you do not have to sort this out alone. Call Fifth Avenue Dental Arts at (619) 853-6655 to book a consultation with Dr. Ramin Ghassemi and find out which option fits your jaw.