‘Kills 99.9% of germs’: are we overdoing hygiene?

PETALING JAYA: For years, the phrase “kills 99.9% of germs” has been treated almost like the gold standard of hygiene. The bigger the number, the safer the product, it seems.

But as antibacterial soaps, sanitisers and disinfectants become a routine part of daily life, some health experts say many people might be using stronger hygiene products more often than they actually need to.

The issue is not hygiene itself, but the growing tendency to treat everyday situations as though they require hospital-level disinfection.

In high-risk environments such as healthcare settings or during illness outbreaks, high-strength antibacterial products play an important role. But outside those situations, constantly reaching for the strongest option may not always provide extra protection – and in some cases, could create other problems over time.

One of the most common is skin irritation. Frequent cleansing, especially repeated handwashing and heavy sanitiser use, can gradually strip away the skin’s natural protective barrier.

Dermatological studies have linked excessive hand washing to higher risks of dryness, irritation and eczema, particularly when done more than eight to 10 times a day.

Many people simply notice their skin becoming more sensitive, reactive or uncomfortable without connecting it to their hygiene habits.

The misconception, experts say, is the idea that removing more bacteria automatically means better protection. But in reality, not all microbes are harmful.

The body naturally hosts communities of beneficial bacteria that help support the skin’s barrier and immune defence. Everyday exposure to microbes is often harmless and, in some cases, necessary for maintaining balance.

That does not mean people should stop practising good hygiene. Rather, it raises a more practical question: does every situation really require maximum-strength antibacterial cleansing?

The same conversation is now extending beyond hand cleanliness. Research has shown that repeated use of strong antiseptic mouthwashes may disrupt the oral microbiome, while overly harsh intimate hygiene products can also affect the body’s natural balance.

In many cases, the goal is not to eliminate all bacteria, but to maintain a healthier environment overall.

As awareness around the microbiome grows, hygiene habits are also beginning to shift. Instead of focusing purely on “maximum kill rates”, newer approaches increasingly emphasise gentler formulations designed for regular daily use, particularly for people with sensitive skin or those prone to irritation.

The broader message is not about “less hygiene” – it is about using the right level of hygiene for the situation. A strong disinfectant may make sense after handling raw food, caring for someone who is ill, or cleaning high-risk surfaces.

But for routine daily cleansing, experts say gentler products are often sufficient.

Over time, smarter hygiene may have less to do with using the strongest possible product, and more to do with understanding when enough is enough.

This article was written by Dr Lai Chin Wei from the Nanotechnology & Catalysis Research Centre, Universiti Malaya.

المصدر: Free Malaysia Today