It does not move
The commonest complaint about a lower denture is that it lifts when you eat. Clipped onto implants, it does not.
Implant-supported dentures
Two to four implants per jaw give a denture something to hold onto. It stops moving when you eat and talk, and the bone underneath keeps being loaded rather than shrinking away.

The commonest complaint about a lower denture is that it lifts when you eat. Clipped onto implants, it does not.
Most patients stop using it entirely, which is usually the first thing they mention afterwards.
Implants load the ridge. That is why a denture fitted ten years ago no longer fits and a new one will not fit for long either.
You take it out to clean it, and it clips back onto the implants. Fewer implants needed, lower cost, easier to clean.
Permanently attached to four to six implants and removed only by the dentist. Closest to natural teeth, and more expensive.
Depends on bone, budget, and how well your hands work. We will go through both properly rather than assuming.
Questions
Sometimes, depending on its condition and how it was made. If it is old and the fit has already gone, a new one is usually the better spend.
Commonly two in the lower jaw for a clip-on denture and four or more for a fixed arch. The scan settles it.
Yes. An upper denture has a palate to grip; a lower one sits on a narrow ridge with a tongue underneath it. That is why lower dentures are where implants make the biggest difference.

Full and partial, with implant options.
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One tooth or a full arch, rooted in bone.
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When a tooth genuinely cannot be kept.
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When a tooth needs covering rather than filling.
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A fixed replacement anchored to its neighbours.
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The appointment that prevents the other eight.
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The first appointment is an examination and a conversation. There is no obligation to book treatment at the end of it.