Blog
How Tooth Decay Happens: The Stages From Plaque to Cavity
Knowing how tooth decay happens helps you stop it early. Bacteria in plaque turn sugars into acid, the acid pulls minerals out of enamel, and over time a hole forms. Early on, fluoride can halt the loss. No probiotic has been shown to do this, and ProDentim has no trial.
Written by the ProDentim label teamUpdated · 4 min read
How does tooth decay happen?
Tooth decay happens when bacteria in plaque feed on sugars and starches and make acid. That acid wears away enamel, the hard outer layer of a tooth (NIDCR, The Tooth Decay Process).
It is a slow process, not a sudden event. Each time you eat or sip something sugary, acid attacks the teeth for a while. Your saliva then works to calm the acid and return minerals to the enamel.
Decay wins when the attacks are frequent and the repair time is short. That is why sipping a sweet drink all morning is harder on teeth than drinking it with a meal (ADA MouthHealthy, Sugary Drinks).
What are the stages of tooth decay?
Decay moves from a hidden stage to a visible hole. The first stages can be interrupted.
A cavity is the end result of the process, and the process can be stopped or reversed before the hole forms (NIDCR, The Tooth Decay Process). The steps below show each stage in plain words.
Plaque builds up
A sticky film of bacteria collects on the teeth, most of all along the gum line.
Acid attacks enamel
Bacteria turn sugars and starches into acid, and minerals leave the enamel.
A white spot appears
Weakened enamel can look chalky. This is still the early, reversible stage.
Enamel breaks down
If the loss continues, the surface collapses into a hole called a cavity.
The cavity deepens
Decay reaches deeper layers and can cause pain and infection. A dentist must treat it.
A white spot on a tooth is an early warning sign, so mention any new spot to your dentist.
How does fluoride help stop early decay?
Fluoride reduces mineral loss from enamel, helps put lost minerals back and makes it harder for bacteria to produce acid (NIDCR, Reverse tooth decay early).
In early decay, before a hole forms, a dentist can apply fluoride to reverse the damage. Once a cavity forms, the damage is permanent and a dentist has to repair it with a filling.
Fluoridated water and fluoride toothpaste are the everyday sources. The ADA says community water fluoridation lowers cavities by about 25% in children and adults (ADA, Water fluoridation is effective).
| Stage | What it looks like | Who fixes it |
|---|---|---|
| Early mineral loss | Often invisible, or a white spot | Fluoride, better cleaning, a dentist's advice |
| Cavity | A hole in the tooth | A dentist, with a filling |
Can a probiotic stop tooth decay?
No probiotic has been proven to stop tooth decay. A review of 50 trials, mostly in children, found that probiotics did not meaningfully prevent cavities (Gruner 2016, probiotics caries & perio).
Some trials report fewer cavity-linked bacteria with certain strains, and one L. paracasei trial found no difference from placebo (Chuang 2011, L. paracasei GMNL-33 null). Counting bacteria is not the same as counting cavities.
No study tested ProDentim, and we do not claim it protects teeth. For the basics, see the oral microbiome basics guide.
What protects your teeth every day?
The daily basics for teeth are brushing twice with fluoride toothpaste, cleaning between teeth and regular dentist visits (ADA MouthHealthy, Brushing Your Teeth) (ADA MouthHealthy, Flossing).
Limit sugary drinks and snacks between meals. Rinse with water after acidic or sweet foods if you cannot brush.
Keep taking prescribed medicine exactly as directed. Tell your dentist about any dry mouth, because low saliva raises decay risk (NIDCR, Dry Mouth Q&A).
FAQ01
Tooth decay, short answers
What is the white spot I see on a tooth?
A white spot can be an early sign of decay, where minerals have started to leave the enamel (NIDCR, The Tooth Decay Process). Show it to your dentist, who may suggest fluoride and better cleaning before a hole forms.
Can a cavity heal itself?
No. Once enamel breaks down into a hole, the damage is permanent and a dentist must repair it with a filling (NIDCR, Reverse tooth decay early). Only the earlier stage, before a hole forms, can be reversed.
Does sugar-free gum or soda cause decay?
Sugar-free soda can still harm teeth, because acidic drinks wear enamel even without sugar (ADA MouthHealthy, Dietary Acids). Water is the safest everyday drink for your teeth.
Are baby teeth worth protecting from decay?
Yes. Decay is the most common chronic disease in US children, affecting nearly 46% of them (NIDCR, The Tooth Decay Process). A dentist can advise on fluoride and brushing for children.
Who wrote this02
Written and reviewed by
Pages built from the label, the sales page and linked NIH, NIDCR, FDA, CDC, ADA, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a USA authorized ProDentim retailer, not by the manufacturer. We earn money when you buy through our order links.
Keep reading
More about ProDentim
USA Authorized ProDentim Retailer
Ready to try ProDentim?
Check your medicines first, then pick a pack. Three or six bottles ship free in the US and cost less per bottle, and every pack carries the 60-day money-back guarantee.
- Secure checkout
- 60-day money-back guarantee
- Free US shipping on 3 or 6
