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Probiotics vs Prebiotics: What's the Difference?

Probiotics are live microorganisms used in defined amounts; prebiotics are substrates used by microorganisms. A product can contain both, but the terms are not interchangeable.

Last updated: September 8, 2026 • Sources checked against the current label and/or current vendor policy where relevant.

What is a probiotic?

A widely used scientific definition describes probiotics as live microorganisms that, when administered in adequate amounts, confer a health benefit on the host. The “adequate amounts” and “health benefit” parts matter: simply detecting a microorganism in a product does not establish a probiotic benefit.

What is a prebiotic?

Prebiotics are substrates selectively used by host microorganisms that confer a health benefit. Inulin is a common example in nutrition research, although much of its established use concerns the gastrointestinal tract.

What about products containing both?

Products that combine live microorganisms with substrates are sometimes discussed under the broader idea of synbiotics. The value of the combination still depends on the actual organisms, substrate, amounts, stability and intended site of action.

How these terms apply to ProDentim

The supplied ProDentim label lists a probiotic blend described as 3.5 billion CFU at manufacture plus 100 mg of inulin. That gives the product both probiotic and prebiotic components by category.

It does not automatically demonstrate that the combination has a clinically established synergistic effect in the mouth.

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Sources & further reading

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