it's pretty much abrasive

Pros: It works for sure. Cons: 1. it's pretty much abrasive. So, be careful, don't press your toothbrush too much and don't spend more than 1 min on the whole procedure, or you will damage your gums and possibly a surface of your teeth. 2. After you've done, a thin black line will remain under your gums most likely. So, I would recommend to use the Waterpik Water Flosser to remove it completely.

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