Keeping Teeth White

How Long Does Whitening Last?

Usually a year or more, and sometimes a few years, depending on what you eat and drink, whether you smoke, and how well you look after your teeth. Whitening lightens the colour of the tooth from within, and that change doesn't simply wash out. What happens over time is that new stain builds up on and in the enamel from the same things that darkened your teeth in the first place, so the shade slowly creeps back.

The good news is that you don't start from scratch. Occasional top-ups with your own trays bring the shade back in a few nights, and the habits below slow the drift so you need them less often.

We record your starting shade before you whiten and compare it with your new shade at your review, so you have a reference point. If you notice your teeth drifting back towards where they started, that's the time to top up.

Top Up at Home

Keep your custom trays. They're made from a scan of your teeth and they're the personal part of the kit, so store them in their case and clean them with cool water and a soft brush. Top-up gel is available from the practice, and a few nights of gel every so often restores the shade. Many people do this before a holiday, a wedding or a run of photographs.

Use the gel as we showed you, for the time we advised, and don't be tempted to wear it for longer to speed things up; more time mostly means more sensitivity. If your trays no longer fit because you've had a crown, bonding or other dental work, we can scan you for new ones.

What Stains Teeth?

• Tea, coffee and red wine, which are rich in tannins and colour
• Curry, soy sauce and tomato-based sauces
• Berries, beetroot and dark fruit juices
• Cola and other dark fizzy drinks, which are acidic as well as coloured
• Smoking and vaping

There are two kinds of stain. Surface stain sits on the enamel and in the film of plaque, and it's what hygiene visits and good brushing remove. Deeper stain soaks into the enamel over years, and that's what whitening lifts. Acidic drinks make both worse by softening and roughening the enamel surface, so colour clings more easily. You don't need to give anything up. Rinsing with water afterwards, or using a straw for cold drinks, makes a real difference.

Habits That Help Every Day

• Rinse with water after tea, coffee and red wine, or finish a meal with water
• Use a straw for cold dark or fizzy drinks, so they bypass your front teeth
• Wait an hour before brushing after anything acidic, so you're not scrubbing softened enamel
• Brush twice a day with a fluoride toothpaste, and clean between your teeth every day, because stain settles into plaque first
• Don't smoke or vape. Smoking stains teeth quickly, even after whitening
• Keep coloured drinks away from whitening trays and retainers, which stain too

Whitening toothpastes have their place: they contain mild abrasives or stain-dissolving agents that remove some surface stain between hygiene visits. They don't change the natural colour of the tooth, and the harsher ones can wear enamel if used every day, so use them in moderation.

Keep Your Hygiene Visits

Professional cleaning removes the surface stain that brushing leaves behind, especially between teeth and along the gum line. Air polishing, often called Airflow, uses a fine stream of warm water, air and powder to lift plaque and stain gently, and most people find it more comfortable than scaling. A hygiene visit is £70, or £100 with Airflow, and both are included in our dental plans.

Every three to six months is usual, depending on your gums. A hygiene visit before a top-up also helps the gel work evenly, because it's reaching clean enamel rather than a film of stain and plaque.

Whitening and Your Dental Work

Fillings, bonding, crowns and veneers don't change colour with whitening, and composite bonding can pick up stain over time, so if you have any on your front teeth the aim is to keep everything matching. Porcelain veneers and ceramic crowns resist stain well. Composite is slightly more porous, so bonding benefits most from the habits above. Polishing at hygiene visits keeps bonding looking its best, and if a filling or bonding no longer matches after a top-up, it can usually be refreshed. If you're planning bonding or veneers, whiten first and wait around two weeks for the shade to settle, so the new work is matched to your whiter teeth. Our guide to whitening before bonding explains the order.

When to Whiten Again

You can whiten again safely under a dentist's supervision, as often as your teeth need it, and for most people that's an occasional top-up rather than a full course. If it's been a few years, or your trays are lost or no longer fit, book a short consultation: we'll check your teeth and gums, confirm there's no decay or gum disease to treat first, and show you a realistic shade before you start. Home whitening is £350, or £315 for dental plan members,² and it's included in every Invisalign and composite bonding package. In the UK, whitening can only legally be provided by a dental professional, so if you're offered it anywhere else, walk away.

Questions

This guide is general information, not a diagnosis. A dentist needs to examine you to say what is right for your teeth.