Great question! First of all, good job on you for being concerned about your oral hygiene! Brushing your teeth no matter what is important; however, aside from removing your current plaque, brushing (with fluoridated tooth paste) after meals helps protect your teeth from acid attacks..
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In my opinion, Tron (TRX) is one of the better cryptocurrency investments out there if you are able to hold and let this major China/Asia project unfold. Tron is famous, and perhaps a little infamous, for its recent bull run and the rapid correction that has caused its price to dip.