The difference in one paragraph
A veneer covers the front of the tooth. A crown covers all of it. That sounds like a small distinction and it is the whole decision, because covering all of it means reducing all of it: the front, the back, both sides and the biting edge.
A veneer takes roughly half a millimetre off one surface. A crown can take one to two millimetres off every surface. In terms of how much of your own tooth is left at the end, they are not close.
When a veneer is right
The tooth is sound. It has no filling, or a small one. It is the wrong colour, or slightly the wrong shape, or a little short.
This is the great majority of front teeth in people asking for a Hollywood smile, and it is the reason veneers are the default answer for cosmetic work rather than crowns.
When a crown is right
The tooth is already compromised, and the honest test is what is left rather than what you want:
- A large old filling taking up much of the tooth
- A crack running through it
- A root treated tooth, which is brittle and needs holding together
- A tooth that has broken
On any of these a veneer has nothing sound to bond to across enough of its surface, and it will fail. The crown is not the more aggressive choice here. It is the only one that works.
The overtreatment to watch for
Crowns are sometimes proposed for healthy front teeth because they are more forgiving to plan: a crown can correct a bigger discrepancy in position or shape than a veneer can, so crowning eight healthy teeth is a quick route to an even result.
It is also the removal of most of eight healthy teeth, permanently, for a cosmetic gain. If that is being proposed for you, ask what is wrong with each tooth individually. A good answer names something about that tooth. A poor answer is about the overall look.
Moving crooked teeth first, then veneering, achieves the same result and leaves you with your teeth. It takes longer. That is the actual trade off.
The one thing that decides it
How much sound tooth you have. Not the price, not the timeline, not how even you want the result to look.
Everything else can be worked around. Enamel cannot: it does not grow back, and every option afterwards is narrower than the one before. More on what that means in practice on whether veneers damage your teeth.