just depends on what's in the drops. Alcohol, flavoring, angel tears, ....???
Water, Alcohol Denat, Glycerin, Polysorbate 20, Flavor, Menthol, Sodium Sacharine, FD&CBlue#1
That is for the IcyMint/WinterMint. Not too bad, the denatured alcohol is a little scary, but it is in so low a quantity in the end result I wouldn't worry about it. In fact I am the one who made a menthol juice with some Icy Mint breath drops. It's OK, but it dries my tounge a little so I discontinued use. But I used SEVERAL drops of it. I don't imagine one drop would hurt anything.