Whitening · CI 77891 / Titanium Dioxide · CAS 13463-67-7

Titanium Dioxide

TiO₂

Titanium dioxide makes paste look white but does not whiten teeth. The nano form was banned in the EU in 2022 due to genotoxicity on inhalation; oral safety studies are ongoing.

QDRO position

We avoid it

Does not whiten teeth — only colours the paste white. Nano-TiO₂ banned in the EU; oral safety studies ongoing. QDRO does not use it.

Effective concentration

N/A (cosmetic pigment)

Typical on market: 0.5–2%

What it is

Titanium dioxide (TiO₂) is an inorganic white pigment with a high refractive index (n ≈ 2.7). In toothpastes it is used exclusively as a cosmetic colorant: it gives the product a brilliantly white appearance that consumers visually associate with cleanliness and whitening. It has no actual whitening effect on enamel — it does not interact with chromogens embedded within the tooth structure.

How it "works" (and why it is not what consumers expect)

TiO₂ scatters and reflects visible light, producing a white, opaque effect. The paste looks white, but this is an optical property of the product itself, not of the teeth. After rinsing, all titanium dioxide is washed away — there is no residual whitening effect whatsoever.

Any formula claiming to "whiten" teeth by virtue of TiO₂ is marketing without substance. Real whitening requires peroxide agents (H₂O₂, carbamide peroxide) or mechanical abrasion (hydrated silica) that actually break down or remove chromogens.

Regulatory risk — the key argument against

2021: EFSA concluded that TiO₂ (E171) could no longer be considered safe as a food additive, due to the impossibility of ruling out genotoxicity of nanoparticles.

2022: EU Regulation 2022/63 banned E171 in food products. In parallel, the SCCS issued an opinion on nano-TiO₂ in cosmetics: it must not be used in products that could reach the lungs via inhalation (sprays, powders). Oral safety studies are ongoing — there is no final conclusion on chronic oral exposure in non-food cosmetics.

The regulatory direction is clear: nano-TiO₂ is on a trajectory toward broader restrictions.

Safety

Conventional (non-nano) TiO₂ is considered safe for external use. The nano form (< 100 nm) raises serious concerns: animal studies show DNA damage in intestinal epithelial cells following chronic oral ingestion. Manufacturers often prefer the nano form precisely because smaller particles scatter light more efficiently — delivering a whiter paste appearance.

Role in the QDRO formula

QDRO does not use titanium dioxide in any formula — neither as a pigment nor as a functional ingredient. The rationale: zero benefit to dental health, combined with regulatory risk and incompatibility with the brand's transparent-formula values. Where paste whiteness is needed, it is achieved through functional components — hydrated silica and nHAp — that simultaneously deliver genuine oral-health benefits.