Optimal fix for crack in enamel? (photos)

Unless there was pain or discoloration, craze lines are usually ignored.  You are correct, a veneer is overkill, but is the only option that is conservative and durable.  A crown is worse and a filling would simply stain/discolor in the near future.It is like the cracks in marbles.  You can't FEEL them, but you can SEE them.  The vast majority of craze lines don't get any worse.

Hi from Richmond Hill!  I would take the easy way out and just leave the tooth alone. No one really sees this but you.  Doing a crown  or Veneer and taking the tooth down would not be necessary and you loose most of your natural tooth. Just be careful and try not to bang any fork or cup against it.  I would just leave your natural tooth alone!

If you are talking about the line vertically on the left tooth in the photo most noticeably more towards the gum line--this is called a craze line-- these are usually not treated as they are very common and only show upon close study when the light is at a certain angle--they tend not to be structural weakened enough to be concerned with further fracturing.We tend to see them more as we get older--some believe they are caused by minor trauma or abrupt temperature changes.That said--if it really does bother you it can be restored conservatively with a composite repair. There is more enamel removed with a typical veneer--be sure to see an accomplished cosmetic dentist as you will want a nearly imperceptible repair. No simple taskDr John Merrill

I believe you are talking about the line from the gums to the top edge of the tooth. Those are called craze lines, and happen from stress within the tooth. Most people get them over time with normal wear and tear. Others get them far more frequently with 'overuse' such as habits biting on items like pens, pencils, nails, etc. The more common reason is bruxism.If this is the scenario, a night guard would be necessary and changing your habits during the day to avoid touching your teeth together more than eating.