Because of this, the market is being flooded with different brands every time and because it is one of those procedures that are fast and effective without the pain (mostly), it is so very easy to ride the bandwagon; yet, side effects could happen even adversely if unbeknown to the customer, the products are not used as indicated. Stains on teeth that are greenish-grey in cast are harder to remove while those that have a yellow cast tend to whiten faster. Since teeth whitening and bleaching are among the simplest cosmetic procedures and provided you do not have cracks crowns porcelain veneers, special teeth and gum conditions, home kits are advisable provided you start with a low mixture of bleaching agents and water. This is a thin layer that partly covers the tooth and forms a wrap for the exposed crown. Following that is the dentin. The dentin is very similar to the enamel except it is not as hard and as shiny and while the enamel is generally white in appearance, the dentin is not. Extrinsic tooth stains forms in the enamel while for the most part, intrinsic stains that show trough the enamel occur in the dentin. The good news is that this product is safe for everyday use. But when abused, then this can bring damage to the teeth than joy. The excessive use and abuse of the teeth whitening paste may damage the person's enamel. So here's the thing, use the product in moderation, or as recommended by the manufacturer. Teeth Whitening and Bleaching Unlike temporary teeth which are shiny, very white and very clean looking, the permanent teeth that follow once the deciduous teeth are lost are usually less porous. Because of this, permanent teeth come in varying shades from white to off-white and sometimes to yellowish. For the formulation that are used by the professionals that conduct supervised teeth whitening procedures, the formulation for the peroxide may reach up to 43 percent and the strength of the bleaching agent will depend on the service provider. This is the reason why those wanting immediate effects will go for the supervised services of the dentist.