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Written and medically reviewed by Dr. Dale Hardy, DMD, Cornerstone Dentistry, Anderson. Last updated September 2026.
Quick answer: Lemon juice is fine for you in moderation: it adds vitamin C and flavor with almost no calories. But with a pH of about 2.0–2.6, it’s acidic enough to soften tooth enamel if you sip it often. Drink lemon water diluted, with meals or through a straw, rinse with plain water afterward, and wait about an hour before brushing.
Lemon water is a popular daily habit, and people often ask us whether it’s good or bad for their teeth. Here’s the good, the bad and the sour, from a dentist’s point of view.
Is Lemon Juice Good for You?
In moderation, yes. Lemons are a source of vitamin C, which your body needs to:
- act as an antioxidant that helps protect cells
- make collagen for wound healing
- absorb iron from plant foods
- support your immune system
Adults need about 75 mg (women) to 90 mg (men) of vitamin C a day. Lemon water can also make plain water more appealing, which helps you drink more of it.
Is Lemon Juice an Acid? (pH Explained)
Yes. On the pH scale of 0–14, 7 is neutral (pure water), lower numbers are acidic, and higher numbers are alkaline. Dental erosion happens when the mouth is acidic, below about pH 4.0.
| Drink or measure | pH | What it means for teeth |
|---|---|---|
| Lemon juice | About 2.0–2.6 | Extremely erosive range |
| Extremely erosive drinks | Below 3.0 | Highest risk to enamel |
| Erosive drinks | 3.0–3.99 | Can wear enamel with frequent sipping |
| Minimally erosive drinks | 4.0 and above | Lower risk |
| Water | 7.0 | Neutral; safe for teeth |
In a study of 379 drinks sold in the U.S., 93% had a pH below 4.0, so lemon water is far from the only acidic drink in most people’s day.
Does Lemon Juice “Alkalize” Your Body?
You may have heard that lemon juice becomes alkaline after it’s digested. The idea comes from the alkaline diet, but a review of the research found the evidence that an alkaline diet benefits health is limited and more studies are needed. What we know for sure is that in your mouth, lemon juice is acidic.
What Happens When You Put Lemon Juice on Your Teeth?
Lemons contain citric acid, and acids in food and drinks wear away the enamel that protects your teeth. That’s why DIY tricks like rubbing lemon on your teeth to whiten them backfire. Instead of whitening, the acid softens enamel. Signs of enamel damage include:
- Discoloration: teeth look more yellow as thinner enamel shows the dentin underneath
- Transparency: edges of the teeth look clear or glassy
- Sensitivity: teeth sting with hot, cold or sweet foods
Is Lemon Water Bad for Your Teeth?
Not if you drink it the right way. A glass of diluted lemon water is far less damaging than sucking on a lemon wedge. (Adding sugar to make lemonade creates a new problem: sugar feeds cavity-causing bacteria.) To protect your teeth:
- Dilute lemon juice well with water.
- Drink it with a meal instead of sipping all day.
- Use a straw to limit contact with your teeth.
- Rinse with plain water, or have milk or cheese, afterward.
- Wait about an hour before brushing your teeth.
Skip lemon juice if you have acid reflux or mouth ulcers, since it can make them worse.
Have questions about your enamel or sensitivity? Talk with your Anderson dentist at Cornerstone Dentistry.
Frequently Asked Questions
Does lemon water damage tooth enamel?
It can, especially if you sip it throughout the day. Acids wear away enamel, and the ADA lists citrus flavors like lemon as a common source of acid in drinks.
Can lemon juice whiten teeth?
No. Rubbing lemon juice on your teeth doesn’t whiten them. The acid softens enamel, which can make teeth more sensitive and look more yellow over time. Ask your dentist about safe whitening instead.
Should I brush right after drinking lemon water?
No. The ADA recommends waiting about an hour after acidic foods or drinks so saliva can wash away acid and re-harden your enamel.
Is drinking straight lemon juice bad for you?
For your teeth, yes. Undiluted lemon juice has a pH of about 2.0–2.6, well inside the range dental researchers call extremely erosive (below 3.0). Dilute it and drink it with meals.
Is lemon juice acidic or alkaline?
Lemon juice is acidic. Some people say it “alkalizes” the body after digestion, but the evidence that an alkaline diet benefits health is limited and more research is needed.
References
- Reddy A, Norris DF, Momeni SS, Waldo B, Ruby JD. The pH of beverages in the United States. Journal of the American Dental Association, 2016.
- American Dental Association. Dietary Acids and Your Teeth. MouthHealthy.
- Iowa State University Extension and Outreach. The Case for Bottled Lemon Juice in Canning. 2021.
- NIH Office of Dietary Supplements. Vitamin C Fact Sheet for Consumers.
- Schwalfenberg GK. The alkaline diet: is there evidence that an alkaline pH diet benefits health?. Journal of Environmental and Public Health, 2012.
The content of this blog is for general information and isn’t a substitute for professional dental advice. Talk with your dentist about your situation.
