Teeth Whitening Limits With Restorations: Why Crowns, Veneers, Resin, and Non-Vital Teeth Do Not Whiten

Will crowns, veneers, or resin get whiter along with whitening?

No. Artificial materials such as crowns, veneers, resin, implant restorations, and bridges do not change color with whitening agents [1]. Whitening works by oxidizing and breaking down pigments deposited in natural teeth, so it has no effect on artificial materials that have no pigments to break down [1]. As a result, only the natural teeth get lighter while existing restorations stay their original color, which can reveal a color mismatch between them [1].

When DentStat analyzed 430 patient comments on teeth whitening with restorations and special cases, questions such as “Will my crown get whiter too?” and “Does it work where I have veneers?” came up repeatedly [3]. This article explains three limits case by case: artificial materials, non-vital teeth, and intrinsic discoloration.

Which materials do not whiten?

The main artificial materials that whitening agents do not act on are as follows [1].

Material or condition	Response to whitening	To match the color
Crowns (zirconia, ceramic, porcelain-fused-to-metal)	No color change [1]	Remake to adjust color
Laminate veneers	No color change [1]	Rebond or remake
Resin (fillings)	No color change [1]	Replace to match after whitening
Implant restorations and bridges	No color change [1]	Remake
Natural teeth (vital teeth)	Lighten as pigments oxidize [1]	Whitening treatment

Whitening agents do not make resin come off, but resin does not follow the color change, so if it no longer matches the surrounding natural teeth after whitening, it is sometimes replaced to match [1].

If I have restorations, how should whitening be sequenced?

The order often planned is to whiten the natural teeth first and then make or replace restorations to match that shade [1]. Because restorations do not whiten, making restorations first can lead to a color mismatch once the natural teeth are whitened later [1]. In particular, when crowns or veneers are planned for highly visible areas such as the front teeth, the sequence of setting the target shade with whitening and then matching restorations to it is considered [1]. The order and suitability depend on the condition of the teeth, so discuss them with a dentist [1].

Can a tooth discolored after root canal treatment be whitened the usual way?

A tooth that has darkened after root canal treatment (a non-vital tooth) needs a different method from regular whitening, which applies the agent to the surface [1]. In a tooth whose nerve has been removed, discoloration develops from the inside, so internal whitening that places a whitening agent inside the tooth is considered separately [2]. Surface whitening alone has difficulty lightening dark color that shows through from inside [2]. However, suitability depends on how much tooth structure remains and the state of the root canal treatment, so whether internal whitening is possible is for a dentist to judge [2]. The comment analysis also found questions about what to do with front teeth that darkened after root canal treatment [3].

Can intrinsic discoloration, such as from antibiotics or mottled enamel, be whitened?

Intrinsic discoloration, where the inner tissue of the tooth itself is stained, has limits with surface whitening [1]. In discoloration from tetracycline-type antibiotics taken in childhood or dental fluorosis (mottled enamel), the pigment is distributed within the enamel and dentin, so whitening that breaks down pigment sometimes cannot lighten the teeth evenly [1]. In such cases, restorative approaches that cover the surface with laminate veneers or crowns are sometimes considered as well [1]. The approach differs depending on whether discoloration is external staining (extrinsic) or has an internal cause (intrinsic), so identifying the cause comes first [1].

Common myths and facts

Some expect that “whitening will make crowns and veneers whiter too,” but artificial restorations do not whiten, so if only the natural teeth get lighter, the color mismatch can actually grow [1]. The idea that “everyone gets equally white teeth from whitening” also does not hold, because the method and limits differ depending on non-vital teeth, intrinsic discoloration, and whether restorations are present [1]. Given the 430 questions about restorations and special cases found in the comment analysis [3], checking your history of restorations, resin fillings, and root canal treatment before whitening is the starting point for reducing color mismatch [1].

For how whitening works, the difference between professional and at-home whitening, and maintenance, see the teeth whitening guide. For restorative treatment such as veneers and crowns, see laminate veneers and crowns. For dental clinics by region, see Find a Dentist.