For others reading, the fundamental problems with your situation are:
1) You can't floss between your veneers.
2) Each veneer's edge creates a ledge that harbors plaque.

As a result of both, gum disease (due to dental plaque accumulation) has developed around the veneered teeth, to the point where it has affected the level of the bone surrounding them too.

As a side note, in cases where bone damage has occurred, as the gums heal and become healthy again some degree of gum recession will likely occur.

That's not necessarily a problem in your case since the veneers will be replaced anyway. But it does mean that if your gums aren't in perfect health when the new veneers are made, and then later on if they do become fully healthy, you could experience some recession which might ruin the appearance of the new veneers.

That means you need a treatment solution that will create the ideal gum situation before your new veneers are made.

Option A - With this option, the dentist is relying solely on medicine to cure your gum problem.

Even if improved brushing can remove more plaque from the edges of your veneers, you'll still have the problem that you can't floss. Therefore plaque will continue to accumulate.

Considering that gum health is paramount for your case, what might be the more predictable approach would be to remove the source of the problem first (the plaque and the inability to remove it), then use medicines to aid the healing of your gums.

Options B and C - These options do that. Their plan seems to be to temporize the appearance of your tooth now, place temporary veneers on the other teeth (so to remove the ledges and so you can floss), then once the gums have healed make new veneers.

There is a difference in the time frame suggested for each option.

In general it takes 10 days to two weeks for gingivits (gum inflammation without the involvement of the underlying bone) to heal. Your situation seems more advanced than that, so the longer time frame seems the more realistic.

You may simply need to take the attitude that you'll put up with whatever it takes to get the job done right this time, even if doing so includes inconvenience or subpar appearance for a while. If so:

1) Let a dentist temporize your tooth with the lost veneer the best that they can.
2) Let them place temporary veneers or fillings on your other teeth (even if they are a nuisance to keep in place or don't look perfect). They must be a type of temporization that removes the ledges and allows you to floss.
(Side note: Your 4th option of leaving the veneers in place could substitute for temporary veners. If the dentist could trim off the ledges and make it so you could floss between them.)
3) Let your dentist treat your gum disease issues (cleaning around the teeth, the use of medicines if indicated).
4) Use this time period to develope the excellent homecare skills you'll need to practice for the rest of your life.
5) At that point when your gums are healthy and stabile (no further recession due to gum health issues is expected), have the new veneers made. (At whatever point in time that is, which will depend on both your initial conditions and how well your homecare keeps your teeth plaque free so healing can occur).

Good luck with this.

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