A 40-something schoolteacher in Taiwan is now facing life with dentures after a health drink she consumed with every meal quietly destroyed her tooth enamel. Dentist Li Ka-kwan recently shared the case on the Taiwanese medical talk show The Lovely Doctor to warn against unverified home remedies that patients believe are beneficial.
The woman had a history of good oral health and had never needed major dental work. But at a routine check-up, her dentist noticed severe enamel erosion that had progressed to the point of exposing the nerves. She eventually lost most of her teeth and needed dentures.
According to Dr Li, the damage was linked to her habit of drinking the same “health beverage” at every meal, hoping it would treat an underlying condition. The drink was highly acidic, and constant exposure weakened the enamel over time. Unlike a cavity, enamel loss is irreversible, and once the underlying dentin and nerves become exposed, severe pain and sensitivity usually follow.
Acidic Drinks and Enamel Erosion
Dental enamel is the hardest substance in the human body, but it is not resistant to acid. When acidic drinks are sipped repeatedly throughout the day, the mouth’s pH level drops and begins to strip minerals from the teeth. Over time, the enamel thins, leading to sensitivity, discolouration, and structural damage.
The teacher’s case is a reminder that “natural” or “healthy” drinks can still be harmful if consumed too frequently. Dentists advise that acidic beverages should be consumed in moderation, and ideally with meals, to reduce their erosive effect.
Mouthwash Cannot Replace Brushing
The case comes alongside a separate report from the Hong Kong Consumer Council, which tested 32 mouthwashes. The council found that while many products claim to prevent cavities, most contain only about 200 parts per million (ppm) of fluoride, compared with the 1,350 to 1,500 ppm typically found in toothpaste.
Dr Chan Wai-ling, representing the Hong Kong Dental Association, said mouthwash should be seen as a supplement, not a substitute for brushing. “Mouthwash cannot effectively penetrate dental plaque,” she said. “It should be used alongside proper brushing and flossing.”
The council also warned that prolonged use of mouthwashes containing cetylpyridinium chloride (CPC) or chlorhexidine may cause tooth staining and temporary taste disturbances. Among the tested products, 11 were identified as safer options:
- Listerine Total Care Mouthwash — HK$25
- Listerine Total Care Zero — HK$45
- Colgate Peroxyl Oral Cleanser — HK$45
- Dr Bright Whitening Mouthwash — HK$52
- Crest Whitening Mouthwash — HK$52
- Elmex Sensitive Mouthwash — HK$70
- Betadine Cool Mint Gargle — HK$79
- Ecostore Complete Care Fresh Mint Mouthwash — HK$92
- Bilkadent Gum Care Mouthwash — HK$95
- Biorepair Antibacterial Alcohol-free Mouthwash — HK$102
- Marvis Strong Mint Concentrated Mouthwash — HK$167
Prices are as tested and may vary.
Protecting Your Teeth Long Term
Dental experts recommend regular check-ups, limiting acidic drinks, and using fluoride toothpaste to strengthen enamel. If you use mouthwash, choose one that suits your needs, but do not rely on it for cavity prevention. A healthy mouth starts with mechanical cleaning—brushing and flossing—while mouthwash only plays a supporting role.
For those considering any “health drink” to treat a medical condition, professionals advise checking with a doctor or dentist first. What seems nourishing may, in fact, be slowly damaging your teeth.