Onyx Stop the Bite Review

Onyx Stop the Bite Review

Price: $8

Sanitary & Health
Ease of Use
User Rating

Effective when used in conjunction with another stopping product, low cost.

Does not work when sleeping, bad bitter taste becomes acquired in about a day, must reapply every 2-3 days.

Our Full Review

Onyx Stop the Bite is an anti-nail biting polish that tastes very bitter, and as a result discourages nail biting for children 4 and older. The manufacturer of Onxy nail polish, and some marketers, also claim that it prevents thumb sucking, however we do not agree.

Anti-Nail Biting Polish DOES NOT WORK for thumb suckers. It is designed for daytime nail biters – and only offers a little reminder. Obviously won’t work while your child is sleeping and their taste buds are turned off. Children under four years old don’t dislike the taste because they haven’t yet developed taste buds to dislike it yet. Nail polish was developed for nails, not thumbs.

It intended to help stop finger nail biting in people who are motivated to quit, however the success rate of thumbsuckers is extremely low. For people who subconsciously put their fingers or thumbs in their mouth during the daytime this is a good reminder to quit. If you are looking for a solution to end adult thumb sucking during waking hours or you simply need a reminder and who really wants to stop fingernail biting, then any anti-nail biting polish is a good choice for you.

While it seems natural that Onyx Stop the bite (or any other anti nail biting polish) would also work to stop thumb sucking, it does not. First, it is important to understand how the polish really works – it tastes bad. Is it so bad that your child will absolutely not put their thumb or fingers in their mouth? Well.. no. It comes down to what is worse, not sucking or enduring a bad taste. For serious suckers, you need something that will physically prevent the thumb from being sucked on.

Although Onyx Stop the Bite usually does not work on its own, when used along with a physical device – one that obstructs the thumb from the mouth – it can be extremely effective. Especially when the device is taken off, the bitter taste will continue to stay on as a reminder. We recommend the nail biting polish be used in conjunction with any product that physically obstructs the thumb sucking.

Many children will actually get used to the taste in about a day, rendering the product totally useless for them. Your child will definitely find the bitter taste disgusting at first, but a stubborn child will quickly get past it. Think of your first sip of coffee… it was probably gross, but then, you learned to like the bitter stuff. Onyx nail polish is the same kind of thing.

For stubborn children, or people who have a psychological dependence on sucking their thumb, the bad bitter taste is not a sufficient deterrent. And for the night-time thumbsucker any anti-nail biting polish absolutely won’t work. Many children go to bed without sucking their thumb, but start to in the middle of the night (this is perfectly natural until the habit is stopped), and they do it while sleeping. Their taste buds are not sending the “yuk” signal to their brain while sleeping. When your child sucks their thumb while sleeping it’s automatic, they don’t know they are doing it. So basically it is involuntarily and when they wake up there is this disgusting left over mouth taste and it is like punishment for an undeserving crime.

  • Effective when used with another product
  • Inexpensive
  • Invisible
  • kids get used to the taste
  • non-effective at night
  • must reapply frequently

Common questions asked about Onyx Stop the Bite nail biting polish for thumb sucking include, is it effective at stopping thumb sucking, and what are Onyx Stop the Bite ingredients.

Is the nail biting polish effective at stopping thumb sucking? By itself, probably not. The reason is simple. Children are more driven by the comfort of having their thumb in their mouth than they de-motivated by the bitter taste, and, the taste has no effect at night time while they are sleeping. Of course, everyone will experience different results. It does work extremely well for some, but results vary and most are not successful, especially with stubborn kids.

Because you are concerned for the safety of our children, we want to know the Onyx nail polish ingredients and potential Onyx Stop The Bite side-effects. Since the product is technically a nail polish it is not intended to be ingested, the FDA has not reviewed it. However, its competitor, Mavala Stop claims that its polish is harmless, and since thousands of people have used it we assume the ingredients are similar and indeed harmless (but do your own research!). And although the ingredients looks less intimidating that those on the back of a Twinkie, they are certainly not all-natural. The Mavala Stop ingredients include Ethyl Acetate, Alcohol Denat., Butyl Ester of PVM/MA Copolymer, Phthalic Anhydride/Trimellitic Anhydride/Glycols Copolymer, Butyle Acetate, Acetyl Tributyl Citrate, Sucrose Octaaacetate, Denatonium Benzoate, Isopropyl Alcohol, Benzophenone-1, CI 60725 (D&C Violet No. 2).

Onyx Stop the Bite should not be used for infants because Alcohol Denatured is made of 95% ethyl alcohol and 5% methyl alcohol in USA. Methyl alcohol is a poisonous chemical, and for infants whose immune systems are undeveloped even tiny amounts can have adverse effects.

Onyx nail polish physical retailers are plentiful. The best price will be a little online of course but not by much because it is inexpensive. You can probably find Onyx Stop the Bite at Walgreen, CVS, or Walmart.


  • Onyx nail polish works best to stop thumb sucking when used in conjunction with a product that physically obstructs thumb sucking. Designed for daytime nail-biters, at best, it is a good deterrent for people motivated to stop.
  • Invisible and non-obtrusive.
  • Does not work for stubborn thumb suckers, or at night, and must be reapplied every 2-3 days.

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  1. I found this website while looking for something better than the anti-nail biting polish I bought for my 8 year old. I bought Mavala Stop, and just like you said, it did not work. My little boy sucks his thumb at night, and once he goes to sleep his taste buds seem to turn off, so this does not work for him.

    Rating: 1
  2. horrible thumb sucking thing it just doesn’t work. It tastes bad but not bsd enough. And if you spill it it can ruin your clothes.

    Rating: 1
  3. It took Saedie (age 5) four days to stop. There were no tears. There were many curled-up and grimacing faces as Sadie unconsciously popped that thumb in from time to time and got a taste of the nasty stuff. It is nasty I tried it. Bitter and lingering. Sadie now likes painting her fingernails pink.

    Rating: 5
  4. Great comments. You are correct. Anti-nail biting polish does not work at night, when most thumb sucking happens. Other products are much more effective.

  5. Cheap enough to try. but the taste gets onto other things and it is true this definitely doesn’t work at night. I’ve got two kids, three and nine. Works for the nine year old who is always sucking his index finger. The little one who no longer get the pacifier sucks rigth through it though. It might work for you.

    Rating: 3
  6. anti nail biting polish works good for nail biting but not thumbsucking. Thumbsucking happens mostly at night, and bad taste doesn’t matter when sleeping. 5 stars for product overall, but 2 stars when related to stopping thumb sucking

    Rating: 2