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question:
I have a dark gray line
that has developed
between my bottom 2
teeth this past year. It
actually looks to be on
one tooth, like a crack.
bleaching does not make
it lighter. what could
it be?
Answer: If
the stain is actually on
the tooth, it is
possible that there is a
deep crack on your
tooth. A crack that goes
deep into enamel or even
the dentin layer of the
tooth, keeps the stain
in a way that not easily
reachable by whitening
gels. The only way to
remove the line in such
a case is restoring the
tooth by composite
fillings and or veneers
and may be a crown if
the crack is large and
deep.
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