Bridge or Implant, and How the Choice Gets Made

When a single tooth is missing, the two usual replacements are a bridge and an implant. A bridge borrows support from the teeth on either side of the gap. An implant puts a new root in the bone and leaves the neighbors alone.

Neither is automatically better. The decision turns on the state of the teeth beside the gap, how much bone is there, how quickly you need it finished and what you can spend. Here is how each one works and how dentists weigh them up.

A bridge uses the neighboring teeth as posts

A conventional bridge is made of three or more joined units. The teeth on each side of the gap are shaped down like crown preparations, and the replacement tooth hangs between them as one solid piece cemented in place. It is fixed, you do not take it out, and the whole thing usually takes two visits over two to three weeks.

The cost of that is enamel. Two healthy teeth get cut down permanently to support a third, and once cut they will need covering for the rest of their lives. If those teeth are already heavily filled or already crowned, that cost is much lower, because they needed covering anyway. If they are pristine, many dentists will hesitate.

An implant replaces the root and leaves the neighbors untouched

An implant is a titanium post placed into the jawbone in a minor surgical procedure, left to fuse with the bone over roughly three to six months, then fitted with an abutment and a crown. The teeth either side are not touched at all, and you clean around it like a natural tooth.

It asks more of you in time and in conditions. There has to be enough bone, and if there is not, grafting adds cost and months. Uncontrolled diabetes, smoking and active gum disease all reduce the odds of successful healing, which is why a dentist may treat gum disease first or ask about smoking before agreeing to place one.

• Bridge: about two to three weeks, two visits, neighboring teeth reshaped
• Implant: about three to nine months in stages, neighboring teeth untouched
• Implant needs adequate bone, healthy gums and reasonable healing conditions
• Both are fixed in place, so neither comes out at night

Bone quietly shrinks under a bridge and not under an implant

The bone that held a tooth root keeps its shape because the root loads it every time you chew. Take the root away and that ridge slowly narrows and flattens over the years. A bridge sits above the ridge and does nothing to stop this, which is why a gap under an older bridge can develop a visible hollow.

An implant does load the bone, so it tends to hold the ridge. On a back tooth nobody sees, this matters less. On a front tooth, where the gum line and the shape of the ridge are what make the result look natural, it can be the deciding factor.

The twenty year cost is a different comparison from the quote

In the United States, a three unit bridge commonly runs somewhere around two thousand five hundred to five thousand five hundred dollars, and a single implant with its abutment and crown somewhere around three thousand to six thousand dollars, more if grafting is needed. These ranges vary a great deal by city, by practice and by case, and a specialist referral usually sits at the higher end.

Over twenty years the picture changes. Bridges are typically replaced at some point, often because decay develops on one of the supporting teeth at the margin, and replacing a bridge means redoing all of it. Implants have a good long term record when the gum around them stays healthy, though the crown on top may need replacing and the implant itself can fail. Ask your dentist what they see failing in their own patients and after how long.

Cleaning is where each one is won or lost

You cannot floss between the units of a bridge, because they are joined. Cleaning underneath means threading floss or using a small interdental brush or a water flosser beneath the false tooth every day. Skip it and the supporting teeth decay at the edges, which is the most common reason a bridge is eventually lost.

Implants do not decay, but the gum and bone around them can become inflamed and recede in a process that behaves much like gum disease. It is largely preventable with daily cleaning between the teeth and regular hygiene visits, and much harder to treat once established. Neither option is maintenance free.

• Bridge: clean under the false tooth daily with threader floss or an interdental brush
• Implant: clean around the neck of the crown as carefully as a natural tooth
• Both benefit from regular hygiene appointments and a check of the surrounding gum
• Night grinding shortens the life of either, so mention it if you grind

How to have the conversation with your dentist

Ask what state the teeth either side are in, because that one answer often settles it. Ask whether you have enough bone for an implant or would need a graft, what the total is including every stage, and how long each route takes from today. Ask what the plan is if the first choice does not work out.

It is a reasonable thing to get a second opinion on, particularly if a general dentist and a specialist would approach it differently. If you want to see who else is nearby before you book one, the directory searches every dental practice in the United States by town or ZIP code and shows the closest first, free and with no account.

Frequently asked

This is general information to help you ask better questions, not a diagnosis. Anything happening in your own mouth needs a dentist who can look at it.