Don’t waste your time or money!
Don’t waste your money. The idea is great but I don’t believe it’s safe. While inserting one the filter came off and went almost into my sinuses.  I wish it had worked but it didn’t. Sorry to say but I will say the Amazon refunded my money for this item and was so nice about it especially because it was a no return or refund policy on it. Had I known it was coming from China I would have never ordered it because it’s terrible trying to return or refund on anything from China.
Rating: 1 stars