Why Experts Warn Against Using Mothballs to Deter Mice (2026)

Why Experts Warn Against Using Mothballs to Deter Mice

Mothballs are a common household item, often used to protect clothing from insects. But when it comes to keeping mice away, experts warn against using them. While mothballs may seem like a quick fix, they are ineffective and can pose serious health risks to both humans and pets. So, what are the alternatives? Let's explore safer and more efficient ways to deal with mice and when to call a professional.

The Risks of Mothball Use

Mothballs contain toxic chemicals like naphthalene or paradichlorobenzene, which slowly turn into gas. This gas is designed to kill moths and other insects, but it's not an effective deterrent for mice. Studies have shown that mice can quickly become accustomed to the smell, especially if there's food or shelter nearby. Not only are mothballs ineffective, but they also pose health risks. Breathing in the gas can cause headaches, dizziness, and even serious health issues like liver and kidney damage. If a child or pet eats a mothball, it can be dangerous.

Moreover, using mothballs may even be illegal. Because mothballs are registered with the U.S. Environmental Protection Agency, it is a federal law violation to use them in a manner inconsistent with the label. And you definitely won't find 'mice control' on its recommended uses.

Safer Alternatives to Keep Mice Away

The best mouse deterrent is prevention. Since mothballs are proven to be ineffective and harmful, here are some safer alternatives to consider.

Seal Up Entry Points

The first step is to seal any entry points greater than a quarter inch with wire screen or coarse steel wool. This includes sealing below doors with high-quality door sweeps. Avoid caulking, as mice can easily chew through it. Pay attention to the seal at the bottom of your garage door, as it may need replacing over time.

Make Food Inaccessible

Store all food and pet food in sealed containers, wipe up crumbs, and take out the trash regularly. Don't forget about your compost and garden. Organic fertilizers contain ingredients that mice and rats like, so store them in a metal bucket with a tight-fitting lid to deter mice from accessing them.

Clean Up Indoor Clutter

Removing clutter is essential for successful at-home pest and rodent control. Without food or places to hide, your home becomes a much harder place for mice to live.

Tidy Your Landscaping

Keep your grass cut short and limit leaf piles in the yard. This can take away safe harborage for mice and other pests and not attract them to your home. Keep tree limbs trimmed to around two feet away from the home, as rodents are great at jumping and can use these limbs as an easy access point to your roof and, ultimately, your home.

When to Call a Professional

If you've sealed up your home's entry points and are still noticing signs of mouse life, such as droppings, scratching noises, or nests, it's time to call a rodent control professional. Mice breed quickly, and just a few can turn into a serious problem fast. Pest control experts can find where they're getting in and create a treatment plan to remove them and keep them from coming back.

Why Experts Warn Against Using Mothballs to Deter Mice (2026)
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