Thymol
I didn’t see that this product had active vapors of thymol before I purchased it.  When I opened the individually wrapped pod, I got a strong whiff of it. It wasn’t a good smell but want too too bad... until it started to irritate me. I was coughing while still in very close proximity to the toothbrush holder. I put it away and I was fine. I recommend opening this away from sensitive noses and in a ventilated area if you have asthma.
Rating: 3 stars