"Closing" a gap usually involves placing bonding on the teeth on both sides of the space. So that means the cost of fixing two teeth (placing two restorations) is usually involved.

In a very technical sense, a dentist could classify that work as any number of tooth surfaces (fillings are usually charged according to how many surfaces they involve). However one would hope that if it was just simple work that took little time that the dentist would just charge it out as possibly just one surface fillings.

Here's a table listing fees for bonded (white) restorations, acording to tooth surfaces.

Your best plan by far (and the best chance of being quoted the lowest fee possible) would be to ask about the cost during a dental cleaning/exam and then returning to have the work done.

The bigger question is why the space has enlarged. Bonding characteristically will wear down (like when placed on a tooth's biting edge) but between teeth usually isn't a location that does.

That would imply that possibly your teeth have shifted some. This could be a normal life event (although it could be kept in check by wearing a retainer). At the other extreme, it could indicate a dental problem, such as teeth that have extensive gum disease.

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