The ideal Vannea prep requires a lot of enamel left on the tooth to actually glue the Vannea onto. In that case, your teeth are still untouched underneath and if you have the Vanneas taken off, your teeth underneath are still fine. If the wood crown is involved, there is going to be some reduction of tooth material. So these kind of things are happening when it's the quick fast solution with very little regard for long-term outcomes.