The type of water you drink can have a measurable impact on your dental health. While most people know that sugary drinks and fruit juices are bad for teeth, fewer realise that the water they choose — tap, bottled, filtered, or distilled — affects their fluoride intake, bacterial exposure, and overall oral hygiene. At Pure Smiles in Fulham, we encourage patients to think about their water choices as part of a complete approach to dental care.
Water is the single best drink for your teeth. It rinses away food particles, dilutes acids produced by oral bacteria, and helps maintain saliva production — your mouth’s natural defence against decay. But not all water is created equal when it comes to dental benefits.
The key variable is fluoride. Fluoride strengthens tooth enamel, makes teeth more resistant to acid attacks, and can reverse the very earliest stages of tooth decay. The amount of fluoride in your water depends entirely on what type of water you drink.
Tap water is generally the best option for your dental health. In many parts of England, including London, tap water is fluoridated or contains naturally occurring fluoride at levels beneficial to teeth. It also contains trace minerals and chlorine, which kills harmful bacteria.
The fluoride in tap water has been shown to reduce tooth decay by approximately 25% in both children and adults. If you drink mainly tap water, you are getting a consistent, low-level fluoride boost throughout the day at no extra cost.
Bottled water is not necessarily bad for your teeth, but it is often less beneficial than tap water. The key issue is fluoride content:
There is also a hygiene consideration. Once you break the seal on a bottle of water and carry it around, bacteria begin to multiply — particularly if the water warms to room temperature. Unlike tap water, which you typically drink fresh, bottled water that sits in a bag or car for hours provides a warm, moist environment where bacteria thrive.
Filtered water has grown in popularity through products like Brita jugs and built-in tap filters. While filtered water removes chlorine taste and some contaminants, the filtration process can also strip out beneficial fluoride.
| Filter Type | Fluoride Removed? | Notes |
|---|---|---|
| Activated carbon (Brita, etc.) | Some — varies by model | Check manufacturer specifications |
| Reverse osmosis | Yes — almost entirely | Removes up to 95% of fluoride |
| Distillation | Yes — completely | All minerals removed |
| UV filter | No | Targets bacteria, not minerals |
If you use a water filter at home, check whether your specific model removes fluoride. Some filters are designed to retain fluoride, while others strip it out entirely. If your filter does remove fluoride, consider supplementing through fluoride toothpaste and mouthwash, and discuss options with your dentist.
Distilled water is the purest form of water available — all minerals, chemicals, and vitamins have been removed through the distillation process. While it is not harmful to drink, it offers no dental benefits whatsoever.
Distilled water contains zero fluoride, zero minerals, and nothing that actively supports tooth health. If distilled water is your primary source of hydration, you will need to ensure you are getting adequate fluoride from other sources to protect against cavities and [tooth decay]learn more.
Fluoride is not a luxury — it is one of the most evidence-backed preventive measures in dentistry. The UK Chief Medical Officers recommend water fluoridation as a safe and effective way to reduce dental disease across the population.
For adults, the primary sources of fluoride are:
If you are unsure whether you are getting enough fluoride, your dentist can assess your risk and recommend appropriate supplementation.
You do not need to eliminate bottled or filtered water from your routine. The best approach is a balanced one:
Any safe water is far better than sugary drinks, fruit juices, or no hydration at all. The goal is simply to be aware of what your water does and does not provide for your teeth.
London tap water is not artificially fluoridated, but it does contain naturally occurring fluoride at low levels. The fluoride content varies by area. You can check your local water quality report through your water supplier’s website.
Plain sparkling water is slightly more acidic than still water due to carbonation, but the effect on teeth is minimal. It is far less acidic than fruit juices or fizzy drinks. Flavoured sparkling waters with added citric acid are more of a concern and should be consumed in moderation.
Where safe tap water is available, it is generally the better choice for children because of its fluoride content. Children’s teeth are particularly vulnerable to decay, and the fluoride in tap water provides ongoing protection.
If you have questions about fluoride, water quality, or how to optimise your oral hygiene routine, the team at Pure Smiles in Fulham is here to help. We provide personalised dietary and hygiene advice as part of every [check-up appointment]learn more.
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