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She's looking good. Stay away from peroxide toothpaste, the simple plain Colgate is best.
That color coming through in the handle , is probably the layer of metal coming through, I could be wrong,...

Go from a mild, to a heavy clean if necessary:
A soft toothbrush with dish soap to begin with, then evaluate;
a soft toothbrush with a "mild" sensitive white toothpaste, evaluate;
then some white...

We'll be waiting on the photos,,,,probably a Gillette.