Teeth Whitening- Bleaching White

Teeth Whitening- Bleaching White

(“When bleaching teeth bleaching called”), the accumulated pigments crushed by a whitening gel, so they lose their color. The teeth then appear whiter. Whitening is non-invasive, relatively simple, safe and can be repeated It is possible to distinguish between bleaching from the outside and bleaching from the inside.

How are the teeth getting dark?

The natural tooth color is determined by the color of the dentin (dental bone). The overlying enamel is transparent (transparent), but may discolor the tooth due to deposits.

Discoloration from the outside (external) is caused by:

  • Niko Transportation
  • Coffee, tea, red wine
  • Fruchsäftecolor pigments
  • Caries
  • fillings
  • drugs
  • Hygiene products (chlorhexidine, iron- or nitrate-containing preparations)

Internal discolouration (internal) caused by:

  • insufficient root canal treatment
  • Dead nerve, accident, trauma, bleeding
  • Older
  • Calcifications after accident or aging
  • fluorosis
  • Deficiency diseases (vitamins, calcium)
  • Tooth formation disorders
  • Medicines (eg tetracycline)

Mostly it is about deposition of dyes (pigments) from food and beverages. Especially nicotine can cause very strong discoloration, but also coffee, red wine and tea. Since these discolorations are merely deposits, they can be easily removed with regular personal and professional teeth cleaning .

Prerequisites – Indications – Contraindications

Basic requirements for a bleaching are the following points :

– A very good oral hygiene

– no gingivitis or active periodontitis

– no caries (“open hole”)

– no untreated devitalized (root-dead) teeth

When is a whitening indicated (indication)?


– Superficial discoloration

– Teeth with a darker color structure

– Discolored teeth after root canal treatment

– slight tetracycline discolorations

– Light fluorosis

What speaks against a bleaching (contraindication)?

– very extensive tooth cavities (pulps)

– Hypersensitivity in exposed tooth necks

– Strong abrasions

– allergy to ingredients of the bleaching gel (carbamide peroxide, carbapol, glycerol, propylene glycol, sodium stannate)

– Pregnancy

– Heavy smoker (> 20 cigarettes / day)

– Strong temporomandibular joint discomfort (here more bleaching in practice)

– teeth with enamel-forming disorders (amelogenesis imperfecta)

Techniques of bleaching

If all teeth are to be lightened at the same time, today bleaching at home by means of a splint is the means of choice (home bleaching). Individually manufactured rails are filled with gel and worn daily for up to 45 minutes.

If a single tooth has become dark – usually greyish-black – the cause is usually a dead nerve or a root canal treatment . In both cases, it should first be checked whether the root canal treatment is in order. Or needs to be replaced. Subsequently, the tooth can be filled from the inside with bleach gel. This ” internal bleaching ” can be performed either in the dental office (“in-office”) during a session or by means of a bleaching insert for 2-7 days (“walking bleach”).

What can I expect from bleaching?

Basically, a teeth whitening by 2-3 color levels without damage to the tooth can be achieved. From the goal to get super-Hollywood snow-white teeth is strongly discouraged. Not only does it look unnatural, but especially the repetitive over-bleaching leads to damage of the tooth substance with possible structural damage and fractures.

Not all discolorations respond equally well and permanently to bleaching . Yellowish-orange-brownish discoloration shows a better prognosis than bluish-greyish-black. Likewise, teeth of older people darken faster than boys. For very strong or dark tooth discolorations the desired color with bleaching alone can not be achieved. Advanced therapies may be indicated.

Risks and side effects

Basically, there are very few risks associated with whitening under dental supervision. The techniques and materials used have been studied for over 10 years and are now considered safe and non-invasive methods.

In the literature no allergic reactions are described

The gels used are not toxic. The lethal dose is about 7 liters of a carbamide peroxide solution (safety factor 100-1000).

The most common side effect is cervical sensitivity . With moderate use, these sensations are mild and reversible. A short exposure for 1-4 days fixes the problem. Prophylactically, the tooth necks can be sealed before bleaching.

Pain in the temporomandibular joint is rarely possible when wearing the splint overnight. With a bleaching in practice, the rail can be bypassed.

Tooth- colored fillings are not brighter by the bleaching process and appear darker after bleaching than the brightened surrounding tooth. Therefore, it may be necessary toadjust or replacethe filling after the bleaching to the new tooth color.

How long does it take to lighten and how long will the teeth stay white?

Depending on the cause, home bleaching with splint takes between 2-5 weeks. To achieve the desired result, bleaching may require more than one session in practice.

A bleach deposit is usually left for 2-7 days.

The prognosis depends on the cause of the discoloration, if it is an internal discoloration. However, if it concerns deposits (nicotine, coffee, tea), the result can be obtained for a period of 1-3 years if the consumption remains constant. A re-bleaching is possible after 9 months without problems, while the bleaching rail can be used again.

But also here: Prevention is better than cure = dear teeth thoroughly clean themselves as regular bleaching (cause therapy instead of symptom control)

Alternatives – Supplements

If it is not possible to achieve the desired tooth color by means of bleaching , the following methods are available:

” Whitening toothpastes”

So-called “whitening pastes” usually have a good cleaning effect, ie they remove deposits relatively well. They are a very abrasive (drag much tooth substance away) and thus leave a rough surface on the faster again dyes and bacteria can attach. In addition, they are usually not able to make teeth brighter effectively. Therefore, you can not replace bleaching under dental supervision. Their use should be very limited (1-2 times a week), with little pressure and a soft brush.

Micro abrasion

In the case of microabrasion, the most superficial enamel layer is abraded and reshaped using a special gel. melt formation disorders lends itself to this process. It can be applied individually or in combination with a whitening t.

Veneer (laminates, ceramic facet, veneer)Veneer

If in addition to the tooth color also a change of the tooth shape or position desired, a veneer can be glued in the ideal color and shape. The advantage consists in the substance protection, the lasting aesthetics and relatively simple technology. Cost per veneer CHF 900.- CHF to 1400, -CHF (depending on number).


The last but also the most invasive way to cover discoloration is the crowning of a tooth. This treatment method is indicated for older teeth (> 50 years), which already carry large fillings, with tooth position errors and for covering strong discolorations in the area of ​​the cervix. However, the removal of substances is considerable and the costs amount to around CHF 1,600.

Which method is the best for me?

If the discoloration affects older teeth and is mainly due to the consumption of tobacco, coffee, tea or red wine (ie they are only deposits), a very good oral hygiene and regular professional tooth cleaning in the dental office are the means of choice Not from, a home-bleaching can be done.

If the teeth naturally have a darker base color, then the home-bleaching by means of a rail offer. In case of drug-related discoloration, bleaching may also be indicated in practice.

If a single tooth is affected, an internal bleaching usually leads to success in practice or by means of an insert.

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