Pen was too dry to apply effectively. Didn't last long. Wore off quickly. Didn't work for me.

This stuff works well, it tastes bitter, so you are reminded immediately that you don't want that nail in your mouth. And, the pen applicator made it easy to carry one in my purse for reapplying after washing hands. Loved it, and I received two for the price of one!

This has really helped my 5 year old stop biting his nails. I almost went for the more expensive one, but saw it had chestnut in it and he has a nut allergy. Simple ingredients in this, and very effective.

I bought this for my daughter who has an awful habit of biting her nails. The product went on easily for the first few applications. It definitely deterred her from biting, however, after a few uses, the marker dried up and was unusable.

Easy to use, dries in 15 seconds, not visible on the nail. It's a felt tip marker with very bad tasting liquid. I've been biting my nails for so long it's become automatic, so I don't even realize I'm doing it. This product gives me a bitter reminder that I'm starting to bite.

This pen was empty. Dried out like a 10 year old marker that had it's cap off.so really i can't tell you if the product is good or not, but the manufacturer gets a big frownie face. not to mention they don't have a main website or way to contact them about the problem. [...]

I have been sucking my tumb since I was a little girl , I am now 30 years old and really wanted to stop. This product is convienent ; fits in your pocket ; and works. The taste is so bad you won't want to put your fingers anywhere near your mouth. One thing if you are going to be doing any eating that involes licking your fingers wash your hands twice , this thing is powerful and lingers.

Great product. The taste is horrible. Imagine an orange peel about 5 times worse and lasting about 3 minutes. I bite my nails below the tip of my fingers, always taking the white part of the nail off. Its effective, but the only con (it can be a pro, depending how you look at it) is that you must wash your nails very good before eating certain foods like pizza, burgers, or any finger foods. (You should do that anyway) The other con or pro is that you shouldn't touch your face or lips, especially if you have a girlfriend or boyfriend because the taste transfers from your fingers to where you touch. It's good though, it forces you to keep your hands free. On a side note, I've been using it for about 1 week now and I've learned to refrain from biting my nails even without the pen. So, it's only a while that you need it. I'm on my second week, and still using it to really break the habit.