Pigmented liquid: Sometimes a chemical reaction happens from something you ingested or swallowed with something already in your mouth. The fact that it want away with physical brushing tells that it was superficial and extrinsic, not from within.
Answered 12/9/2016
4.8k views
No worries!: It was probably something you have eaten.
Answered 11/28/2017
4.8k views
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