Diagnosis is not the whole job
Your dentist tells you what your tooth looks like today. That is diagnosis. It is important, and most dentists are good at it.
But you are not going to live in today. You are going to live with this tooth for the next five, ten, or thirty years, under real chewing, real grinding, and real biology. The honest question is not only what is wrong now. It is also what will happen next.
Answering that second question is called projection. In the Keep Your Teeth Framework, projection is not extra work a dentist does when there is time. It is part of the standard of care.
What a good projection covers
A projection is a structured estimate. When it is done well, it accounts for four specific things.
Structure. What is still holding.
How much of your original tooth is left, and how strong is what remains once the planned procedure is finished? A large filling in a thin-walled molar leaves less to work with than a small filling in a strong one, even if both look successful on the day they are placed.
Force. How hard this tooth gets loaded.
Grinding, clenching, and hard chewing can double or triple the stress on a single tooth. A projection has to include the way you actually use your teeth, not a generic estimate. Two people with the same filling can have very different outcomes if one of them is a nightly grinder.
Time. How long this needs to hold up.
A restoration that lasts five years is a very different decision at age 30 than at age 70. Time also accounts for how quickly a crack, cavity, or fracture line is likely to progress. Slow progression may justify watching. Fast progression may not.
Long-term stability. How predictable the outcome is.
Long-term stability puts Structure, Force, and Time together and asks a single question: how confident can we be that this will still be intact and functional in ten years, twenty, thirty?
If a plan skips any of these four, it has not been fully projected. That does not automatically make the plan wrong. It means the plan has not fully accounted for the future you will live in.
What projection sounds like in a real visit
A dentist who is projecting will talk about your tooth in the future tense. You will hear things like this should hold for about ten years if the bite stays even, or if the crack extends past this line, we would change the plan, or the risk here is a root fracture around year seven, not a filling failure at year three.
These are honest statements. They may not sound as certain as we fixed it. That is not a weakness. It is what accurate looks like when the subject is the next few decades of a living tooth.
Three questions you can ask
If a recommendation feels rushed or one-dimensional, it is fair to ask three questions. None of them are confrontational. They are the same questions the doctrine asks internally, and a good clinician has answers ready.
- What do you expect this to look like in ten years?
- What tends to fail first with this option?
- If it fails, what is the next decision?
The answers do not need to be exact. They need to exist. A plan that cannot answer any of them has not been projected.
What comes next
The next part of the book, The Model, defines each of the four variables in detail. Once you understand what Structure, Force, Time, and Long-Term Stability mean precisely, projection stops feeling like intuition. It becomes a shared framework you and your dentist can decide within.