I bought this Decay Tooth Color for my role of Fagin. It was delightfully effective and the many kids in the show enjoyed getting grossed out by a nice backstage toothy grin. It stayed on the entire show, though sometimes I may have touched it up at intermission. ( I did eat and drink with it on and it did not come off.) To apply, I cut a piece of gauze and inserted above the tooth line between my gums and lip, then dried my teeth with another piece of gauze or paper towel. Apply on dry teeth. The cap contains a brush. I used the brush and then smeared it around with a Q-tip. You could also use your own brush if you prefer. The product may slightly burn if too much accidentally gets on your gums, but nothing horrible. It can be removed with isopropyl alcohol. I said I was going to try ethanol, but never did (a drop of gin?). This product also wowed other members of the cast.