When carried out by an expert dentist such as Dr. Chan, tooth whitening in London is a very safe treatment. Having a dental check-up beforehand helps ensure the teeth and gums are healthy enough to undergo this procedure, and helps to minimise any risk of side effects. In fact the bleaching gels used by Dr Wyman Chan at the Smile Studio in London are especially designed to minimise sensitivity which is so frequently a side effect of other bleaching treatments. However teeth whitening can cause the teeth to become dehydrated. One of the effects of this dehydration is that it makes teeth appear whiter than they really are immediately after the treatment has been completed. This dehydration is especially apparent if the teeth are whitened quickly in a chair side procedure. This is perfectly normal and the teeth to rehydrate after a few days, and it’s not unusual to notice the shade of the teeth darkens up ever so slightly.
The Cause of Tooth Dehydration
The reason teeth dehydrated this is due to the actual whitening procedure, as most chair side treatments use light to help the hydrogen peroxide penetrate the teeth more easily. The light used tends to be of a quite high intensity and has the effect of literally boiling off some of the bleach on the surface of the tooth. The whitening process is caused by the hydrogen peroxide penetrating the tooth and bleaching away the stains. Some of this light energy is absorbed by the dark areas of the teeth which tend to be located internally, and which include the pulp in the centre of the tooth, and the dentin which is located just underneath the enamel. The dentin contains the natural colour of the tooth. As the light energy warms up these areas it causes the fluids within the tooth to begin to expand, and eventually these fluids are pushed out through the porous surface of the tooth causing slight dehydration.
If you have had your teeth bleached in a dental surgery before, and have experienced sensitivity afterwards then it may have been due to tooth dehydration. It generally takes two or three days for the teeth to rehydrate as they gradually absorb water from your saliva. The fact that teeth do dehydrate when bleached is another reason for not overdoing the whitening treatments, as the teeth are slightly weaker and more brittle when dehydrated and can be more prone to developing cracks.
Dr. Chan’s methods of whitening teeth in his London dental surgery is slightly different from the norm as he uses a unit that gives out thermal energy rather than light energy. The advantage of this treatment is that the thermal energy is more easily regulated and accurately controlled the energy from a light unit. This helps to prevent the increased tooth sensitivity that is found in other chair side teeth whitening in London.
Why Do Teeth Become Sensitive?
The reason teeth become sensitive has to do with the fact that the dentin is porous. It contains lots of little tubules that lead directly to the pulp in the centre of the tooth, and is where all the nerves of the tooth are located. You may already use, or will have seen toothpastes designed especially for sensitive teeth, and these work by blocking up these tubules, reducing sensitivity.