

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to Spain.
🛑 Bite the habit, not your nails—Strong Will means unstoppable control!
Nail Quail's Strong Will Anti-Nail Biting Click Pen is a 7ml, US-made, fragrance-free liquid solution designed to instantly deter nail biting with an intense, invisible bitter formula. Its easy one-handed click pen application fits seamlessly into busy lifestyles, while organic anti-inflammatory ingredients soothe skin. Free from harmful chemicals and certified gluten-free, this vegan-friendly formula empowers users to break habits safely and stylishly.






| ASIN | B01MXXFB59 |
| Best Sellers Rank | #8,619 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #120 in Nail Polish |
| Brand | Nail Quail |
| Brand Name | Nail Quail |
| Customer Reviews | 4.3 out of 5 stars 5,584 Reviews |
| Item Form | Liquid |
| Item Weight | 0.04 Pounds |
| Liquid Volume | 7 Milliliters |
| Manufacturer | Nail Quail |
| Manufacturer Part Number | SW-01 |
| Model Number | SW-01 |
| Number of Items | 1 |
| Size | 0.24 Fl Oz (Pack of 1) |
| Specialty | fragrance-free |
| UPC | 798304393514 |
A**Y
The BEST Nail Biting Deterrent!
Nail biting was embarrassingly the worst habit I had - until I purchased and used this product! I had tried several products prior to this: the nail polishes & a variety of lotions/creams - none of which lasted. I love that this product applies and dries on clear. It also lasts all day with no re-application needed! The taste is extremely bitter, and for me, lingered on for hours after contact - but that’s the whole point of the product. If you are looking for a product to finally stop nail biting, look no further than here. I purchased 2 pens three months ago (1 for my work bag and 1 for my car), and haven’t needed to repurchase due to having success with stopping. My only regret is not taking a “before” photo, but please trust me when I say that this “after” photo is truly unrecognizable!
S**A
Bitterness that lingers. Amazing product!
I’ve tried bitter nail-biting deterrents my whole life, and none of them worked like this one. The first time I went to bite my nails, the taste stopped me instantly. It is extremely bitter. honestly awful, but in the best way! The flavor spreads across your mouth and lingers unless you rinse it out, which makes biting your nails impossible and memorable to not do it again. There’s no smell, no sticky feeling, and it feels natural on the nails. I also love the name “Strong Will.” Every time I use it, it reminds me that I do have control over my habits, especially with the right tools. This product works exactly as intended. Highly recommend.
C**L
Effective, but not long-lasting
Overall, this is a good product, but having used more traditional nail-polish-type deterrants in the past, I found this to be less effective. I'm giving it four stars due to the application being very convenient and different, but the result was that I ended up biting my nails again more often, as I will explain. I am a lifelong heavy nail biter, and despite using deterrants for 2 years and trying very hard to curb the habit, it's still a challenge. For the last 2 years I used Mavala stop nail polish, which has an intensely bitter taste and is basically a clear bottle of nail polish with bitter chemical added. As long as I keep this nail polish on, I can't bite my nails. Although the polish is water resistant, it wears off in about 2-3 days and by the end of the second day, I may find myself putting my fingers in my mouth some and attempting to bite my nails despite remnants of the bitter polish still being there. This is where these deterrants all hit a snag for me. If I'm not diligent about keeping it on my nails, I go back to biting. Which brings me to the Nail Quail. I bought it to try something different. This product has a similar strong bitter taste, and the applicator is so much more convenient than the nail polish bottle. Initially I was extremely happy with the product because of how much more quickly I could apply it to my nails, and it dries fast too as it is water-based. However, also because it is water-based, I found that within a single day it has already washed almost completely off of my hands (I wash my hands regularly throughout the day, especially when I'm working). To use this effectively, I need to reapply it multiple times each day, instead of ~3 times each week. That doesn't mean it's totally ineffective, but for my case it isn't perfect either. The shape of the product is like a marker, and I think it's meant to be slipped into a pocket or purse to carry around and reapply when out and about. I haven't done this, but I suppose I'll need to start. If I could get a formula of this that was more water resistant with the same applicator tip, I think it would be just about perfect.
S**N
Effective but strong!!
I've been a biter since I was a kid... nails, cuticles, the finger flesh itself --- I'm in my 40s now and I swear by this stuff. I've bought it 4 or 5 times now. Admittedly, I'm not consistent in my application of it so one pen lasts me at least 4 months. Also, it hasn't broken the habit in that I still bite my fingers without it, but not as much. I apply quite a lot at one time. I click about 3-4 times until I see the liquid visibly on the brush tip and apply it to the end of each finger. I only have to apply it every 2-3 days as I can taste it after washing hands several times, taking a shower, washing dishes. It does dry out my fingers a bit, but I just add cuticle cream or a tiny bit of hand lotion to combat that. I'd say the only downside for me is that any finger foods can end up tasting like it if you're not careful and if you tend to lick sauce or something off your fingers, don't!
A**N
Effective but transfers to everything, wouldn’t recommend
The pen itself is good quality, works well. The product goes on nicely & it’s easy to use. This is for my 10yo daughter, I bought this bc the one we usually used was out of stock. The major con & a reason I will be returning - it gets EVERYWHERE & ON EVERYTHING. I don’t even know how. Even once it dries it transfers to anything you touch, food, drinks, it then gets in your mouth, on your lips, etc etc. If we hadn’t already used a really good nail biting polish (doesn’t transfer at all) I maybe wouldn’t be returning this & assume this is just how it is. But it’s not, there are actual clear nail polishes for nail biting that don’t do this at all. For this reason, I would not recommend.
T**A
Really bad taste, deters my autistic son
Well, it works better than I almost had hoped lol.. My autistic son has been subconsciously putting his fingers in his mouth. Not anymore, to keep it short. Be cautious, it causes my son to gag when its fresh. He needs to rinse out his mouth, Understandably. I tried it before putting it on him and its horrendous. 5 stars. Glad I got it!!!
G**S
Worked in 1 Night!!
Amazing Product! I have tried other brands and nothing seemed to work. My 3 year old daughter has been sucking her two fingers since birth. This worked in 1 night of using it!! Miracle product!! She no longer puts her fingers in her mouth:) Highly recommend!
C**Z
Best Nail Biting Product I've Tried!
This product actually works! I've been biting my nails and cuticles for as long as I can remember. I've tried so many times to stop, but it's so hard because its a compulsion I do without thinking. I've tried various anti-nail biting products in the past and none helped. They either don't taste that bad, or the taste is delayed so I've already bitten my nail/cuticle by the time the bad taste kicks in which kinda defeats the purpose. With this product the taste truly awful and instant. I love that it's a liquid because I can use it with cuticle oil, or nail polish. It also absorbs into the skin so it lasts a long time though the bitterness does fade over time, but it's nice that it's still there even if you forget to reapply.
S**A
Lo recomiendo
Me ayudo a quitar el mal hábito de mi hijo de 5 años de morderse las uñas ya no se las muerde!
J**8
Finally a product that works
I had tried so many things for my 6 years old to stop sucking her thumb at night ( dr thumb, thumb guard…) only this is working!
D**B
100% works
My son is a anxiety nail bitter and also special needs and we had tried everything else out there to help to stop biting and let me tell you this stuff works!!! Unfortunately I can not find it to buy it again so he has gone back to biting. I needed up getting some on my finger without knowing and yup definitely nasty tasting🤢
N**M
Stopped me from biting nails
This stuff tasted so nasty . I mean that as a really good thing . I managed to stop biting
A**R
Item Arrived broken and leaking
Trustpilot
2 days ago
3 weeks ago