First I tried to stain the sets of teeth with coffee, but the coffee didn’t make a good stain.
Then I tried chocolate syrup. They looked stained so when they dried I started brushing them with different
toothpastes. Then I noticed a lot of the coming stain.
The results were the same for each set of teeth and toothpaste.
It is possible that the plastic teeth couldn’t hold the stain properly.
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