I live in a city without fluoridated drinking water. Do I have any options for adding fluoride to my tap water?

I found countless results online for filters that can remove fluoride from tap water, but I would like to do the reverse and add fluoride to my water. I am asking the opposite of this question about removing fluoride.

Ideally, I would be able to install some sort of faucet-mounted filter (similar to the image below) that could add safe levels of fluoride to my tap water. Presumably this device would need to be refilled or replaced once in a while. Unfortunately, I suspect that this type of device probably does not exist.

Does a device like this exist? If not, do I have any other options for adding fluoride to my tap water?

I rent an apartment and I am not permitted to make permanent changes to my plumbing. I would prefer options that involve minimal / reversible modifications such as a faucet mounted filter (i.e. solutions that won't upset landlord).

I am aware of the alternative methods for getting fluoride, such as:

  • Fluoride containing toothpaste
  • Fluoride containing mouthwash
  • Fluoride supplements

However, I am specifically asking about ways to add fluoride to tap water and I am not asking about these alternative methods.

  • 5
    considering excess consumption of fluoride is lethal, I doubt any product exists that could safely deliver the right amount with no chance of over exposure. I'd honestly recommend brushing with a dental fluoride treatment if you're really concerned.
    – SqlACID
    Sep 21, 2016 at 0:15
  • 4
    Ingesting fluoride is about as good an idea as ingesting polonium. It was yet another one of those stupid 1950s sorcerer's apprentice "let's tamper with the human enviromnent, for science!" (really for corporations) technological hubris, that didn't pan out so well in the end. The only part of your body that has any use for fluoride is teeth, and you can deliver it there without the health issues of ingesting it. Don't take my word for it, ask your doctor. Sep 21, 2016 at 1:24
  • 4
    @Harper and spicetraders, you are both wrong. According to my dentist, the best way to get a regular, measured, effective dose of beneficial fluoride for dental protection is by prescription tablet. I believe him as my 3 children had ZERO cavities growing up (compared to me and my siblings, too many). And they have no apparent deficits other than millennial apathy, cynicism, pessimism, and sarcasm. Sep 21, 2016 at 2:22
  • 2
    No dispute there, it's great for your teeth. Long as you don't care about any other parts of your body. Sep 21, 2016 at 7:41
  • 3
    Anti-vaxers vs everyone else :) My dentist, who is a friend, questioned how my a water tap on my kitchen sink was installed; I explained simply by a flex steel line and a water filter and he questioned wether the filter removed fluoride from the line (I don't know if it does or doesn't). Fluoride delivered via municipal water services is a perfectly valid and non-lethal way of helping to protect your teeth. Adding it to the supply post might be difficult to get the proportions correct, but I'd like to see a count of confirmed illness or death of people drinking floridated tap water.
    – lsiunsuex
    Sep 21, 2016 at 10:41

4 Answers 4


I know this has gotten a bit off topic, but in an attempt to answer the question - according to my wife, a hygienist - your best bet is to use:

  • Fluoridated toothpaste
  • Take a fluoride supplement

However, I am specifically asking about ways to add fluoride to tap water and I am not asking about these alternative methods.

Too much fluoride can harm you. After researching this morning, I don't see a way to add it to actual tap water coming out of a faucet as your looking for. Trying to calculate water pressure, flow rate, storage and release time of fluoride tablets would be rather difficult I think. Similar to trying to add a multi vitamin to tap water stream. To little and it'll be ineffective; to much and it would make you sick.

This article may help

According to the CDC, "if fluoride levels in your drinking water are lower than 0.7 mg/L, your child's dentist or pediatrician should evaluate whether your child could benefit from daily fluoride supplements." The American Dental Association has a standard dosing schedule for fluoride supplements. Fluoride can be given in liquid form or in tablets and is usually taken twice a day and can be mixed with juice, milk, water, or food.

In your conversation with your dentist, you may find that supplements are not necessary if your child drinks a lot of tap water at school or a day care, and if your toothpaste has fluoride and is used on a regular basis. Have an open conversation with your dentist about how to get enough fluoride if you are drinking mostly bottled water, or if you use any alternative to tap water.

Ultimately, discuss this with your hygienist (it's more of the hygienist's responsibilty to answer this then the dentist's) and see if they can recommend a treatment plan or alternatives outside of the dental office.

  • 1
    This is all assuming that there is no fluoride in the OP's drinking water. Fluoride is in water naturally. The OP did not say he went to the trouble of getting it tested, so we don't even know what quantity of fluoride is in the water to begin with.
    – Edwin
    Sep 21, 2016 at 21:01

As far as I can tell, no mechanism exists except for large scale water treatment plants, which are controlled to a strict 0.7 parts F to 1 million parts water. There used to be supplement pills you could get for free at the pharmacy, many years ago, but now you have to get a medical prescription and pay.


Controlling the dose, 0.7 ppm MINUS any that is already in your water supply from well waters, could be difficult. I would not chance it without real dilution equipment rather than a peristaltic pump or some kind of venturi. Tygon can degrade and holes can clog. Mass flow controllers ain't cheap

I've considered using simple, manual dilution using either pure USP grade (or NF) Sodium Fluoride and some standard volumes (or masses). Alternatively starting from a commercial dilute solution (0.1M) is promising. Each purchase can involve less of the compound to waste (4.2 grams in solution rather than 100 grams pure). This whole idea needs some deference to shelf life of both the pure NaF and the solution as well as a slightly careful error analysis.

For the non quantitative among us, if I drink 4 liters of water tomorrow, I would have a dose of (0.7 ppm F- x 4000 g water =) 2.8 mg F-


Have you considered adding the correct amount of fluoride to water you are going to cook with? You mostly know how much water you use for cooking, so it would be easy to add the correct amount of fluoride salt to that water. Especially when you are making soup or other food where you consume all liquids used in the process. Additionally if you make tea or other drinks, you might add the correct amount to the water used for that as well.

Double check your calculations. Anything (including water) can become toxic if a high enough dose is given.

I have a masters degree in chemistry and teach it in high school b.t.w.

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