activated charcoal mouthwash and nexplanon? hi guys, i am switching to more natural products lately, and i just bought an activated charcoal mouthwash.  also in the past couple weeks i got the nexplanon implant in my arm.  i have heard that activated charcoal can mess with birth control effectiveness when consumed in significant amounts.  however, i am not necessarily consuming it, i'm using it in a mouthwash form.  will this decrease the effectiveness of my birth control implant?  thanks!