Grey or brown teeth from tetracycline antibiotics do respond to whitening, but far more slowly than everyday yellowing. A course is usually measured in months, and the darker band closest to the gum tends to be the last part to change, sometimes without ever fully catching up. When whitening stops making progress, bonding or veneers can cover the colour that remains.
The colour is built into the tooth, not sitting on it
Tetracyclines bind to calcium. When they are taken while teeth are still mineralising, the drug forms complexes with the mineral crystals and is locked inside the tooth as it hardens. A review from the Mayo Clinic describes the result as a permanent discolouration that ranges from yellow or grey to brown, depending on the dose and type of drug (Sánchez and colleagues, International Journal of Dermatology, 2004).
That is why most adults with this staining took the antibiotic as a young child, or were exposed before birth when their mother took it late in pregnancy. Tetracyclines are now generally avoided in pregnancy and in young children for exactly this reason.
Because the colour lies in the dentine, under the enamel, scale and clean visits and whitening toothpastes cannot reach it. Our article on intrinsic and extrinsic tooth stains sets out that difference. Minocycline, a related antibiotic sometimes taken for acne, has also been reported to cause blue-grey staining in adults whose teeth had already formed, so long courses of any tetracycline-type medicine are worth mentioning at your check-up.
Where the banding sits matters
Dentists often describe tetracycline staining in four degrees, a scale described by Jordan and Boksman. A 2022 case report in Cureus summarises it this way:
| Degree | Typical appearance | Likely response to whitening |
|---|---|---|
| First | Yellow to light grey, even, no bands | Often lightens well |
| Second | Golden brown to darker grey | Often lightens, more slowly |
| Third | Blue-grey or blackish with clear bands | May lighten partly; bands can stay visible |
| Fourth | Very intense staining | Whitening reported as unsuccessful |
The same report notes that where the stain sits also matters: heavy colour in the third of the tooth nearest the gum lowers the chance of lightening the whole tooth evenly. Many people fall between degrees.
A whitening course planned in months
The method that has been studied longest is custom trays with a carbamide peroxide gel worn at home, usually overnight. In one study, people with tetracycline staining whitened nightly with 10% carbamide peroxide for six months (Haywood, Leonard and Dickinson, Journal of Esthetic Dentistry, 1997). Courses for ordinary yellowing are usually much shorter.
The biting edges are thinner and usually brighten first. Partway through, it is common for the edges to look noticeably lighter than the necks of the teeth. Shade checks and photographs taken under the same light at each review show whether the teeth are still changing, and the course is usually wound up once several reviews in a row show no further change.
Sensitivity is the most common side effect. It can often be eased by skipping nights, shortening wear time or using a desensitising toothpaste. At Lumi, take-home whitening uses Boutique gels in custom trays; Lumi Home includes an overnight gel for sensitive teeth and a daytime gel for teeth that are not sensitive. In Australia, higher-strength peroxide gels can only be supplied by dental practitioners, which is one reason a long course belongs under a dentist's supervision rather than with shop kits. The teeth whitening page explains how trays are made and reviewed.
How long the result holds
Members of that six-month study group were contacted again about seven and a half years later. Of the 15 who responded, none said their teeth had returned to the original shade, although four had whitened again in the meantime (Leonard and colleagues, Journal of Esthetic and Restorative Dentistry, 2003). Occasional top-ups with the same trays are a reasonable way to maintain the colour.
Covering what whitening leaves behind
If clear banding remains after a fair trial, or a quicker change is wanted, the options are about masking rather than bleaching.
Composite bonding adds tooth-coloured resin to the front surface, usually with little or no enamel removed. Dark grey dentine can shine through a thin layer, so an opaque base is often placed first. Composite stains on the surface over time and needs polishing and eventual replacement. Our page on composite bonding describes the appointment.
Porcelain veneers hide colour more reliably and keep their shade. They involve removing some enamel, often a little more when a dark background has to be blocked out, and that change cannot be reversed. The pros and cons are weighed in our bonding versus veneers comparison, and the porcelain veneers page covers the process.
Crowns are seldom chosen for staining alone. They come into the picture when a tooth is also heavily filled or weakened.
Whitening first is still useful when veneers or bonding are planned. A lighter base needs less opaque material to hide, and it improves the colour of teeth that will not be covered. New restorations are matched to the whitened shade, which is why timing matters; our article on whitening before veneers or bonding explains the sequence.
Typical market costs
These are typical Australian market ranges, not Lumi fees.
- Dentist-supervised take-home whitening: $300 to $700
- Composite bonding: $250 to $800 per tooth
- Porcelain veneers: $1,500 to $2,500 per tooth
- Crowns: $1,500 to $2,500 per tooth
A longer whitening course may need extra gel. Because tetracycline cases are often staged, the total depends on how far whitening gets before any covering is considered. Current offers are listed on the current deals page.
One grey tooth usually has another cause
Tetracycline affects many teeth together. A single tooth that has darkened on its own more often follows a knock or a nerve that has died, and it may be lightened from the inside; see internal bleaching for a dark tooth. White or brown mottling across several teeth may instead be dental fluorosis.
Common questions
Will my teeth end up evenly white?
Even, lighter staining often improves to a result people are happy with. Banded staining usually improves only partly, and Lumi does not promise a particular shade. A dentist can look at the degree and location of the staining and give a realistic idea before you start.
Is whitening for six months safe?
Supervised tray whitening with carbamide peroxide has been used and studied for decades. In the long-term follow-up described above, none of the respondents reported needing a crown or root canal treatment, or ongoing sensitivity, that they linked to the whitening. Well-fitting trays and regular reviews keep the course on track.
Does whitening help if I am getting veneers anyway?
Often, yes. A lighter starting colour can mean less masking is needed, and it brightens teeth that are not being covered.
If you have grey or banded staining and would like to know what is realistic, the team at Lumi Dental in Melrose Park can assess and photograph the staining and set out the options, from whitening through to covering. Free cosmetic consults are listed on the current deals page.
