Anti-Tartar · Zinc Citrate · CAS 546-46-3

Zinc Citrate

C₁₂H₁₀O₁₄Zn₃

Zn²⁺ ions inhibit tartar crystallization, neutralize VSCs (odor molecules) and suppress bacterial enzymatic activity. The standard in professional toothpastes.

QDRO position

We use it

Standard in professional pastes — inhibits tartar formation and neutralizes VSCs

Effective concentration

0.5–1%

Typical on market: 0.3–0.5%

What it is

Zinc citrate is a salt of zinc and citric acid. It has been used in professional dentistry since the 1980s as a more bioavailable and less irritating alternative to zinc chloride and zinc sulfate.

Zinc is an essential trace element involved in the function of over 300 enzymes in the body. In the oral cavity, its concentration in saliva is a key health factor. When zinc is deficient, the rate of dental plaque and tartar formation increases.

How it works

Tartar inhibition. Zn²⁺ ions compete with calcium for binding to phosphate groups. This disrupts the crystallization of hydroxyapatite from supersaturated saliva — which is exactly how tartar forms. The mechanism does not dissolve existing tartar, but significantly slows new tartar formation.

Antibacterial action. Zinc ions inhibit many bacterial enzymes: they disrupt bacterial DNA synthesis and block energy metabolism enzymes. Particularly effective against anaerobic gram-negative bacteria responsible for periodontal infections.

VSC neutralization. Volatile sulfur compounds (VSCs) — hydrogen sulfide H₂S and methyl mercaptan — are the primary odor molecules in halitosis. Zn²⁺ ions form insoluble sulfides with these molecules, chemically binding the odor rather than masking it with fragrance.

Why the citrate form is superior

| Parameter | Zinc Citrate | Zinc Sulfate | Zinc Chloride | |---|---|---|---| | Bioavailability | High | Medium | High | | Mucosal irritation | Minimal | Moderate | Moderate | | Compatibility with other ingredients | Good | Lowers pH | Aggressive | | History of use | Since 1980s | Since 1960s | Since 1950s |

The citrate form has higher bioavailability — citrate ions enhance zinc absorption by the mucosa. This means the same effect is achieved at a lower concentration.

Safety

Zinc is an essential element. At recommended concentrations for topical use, it is entirely safe. Excessive swallowing of paste (unlikely with adult use) can cause GI irritation, but at realistic toothpaste doses this is not relevant.