Those who want to save money and whiten their teeth comfortably at home, do-it-yourself kits are an ideal solution but there can be good or bad available. Whitening kits are normally bought over-the-counter, online or by mail-order.

Teeth whitening kits that include trays really work. They work because the whole teeth is exposed to the whitening agent so all gaps and cracks are taken care of the same way as the front of the tooth, thus ensuring the consistency of the whitening. The whitening gel is sprayed to the tray, put in to the mouth and let it be there for the recommended time, which is usually between 30 minutes and over the night, depending on the strength of the used gel.

Normally the teeth whitening kit includes trays (mouthguard), carbamide or hydrogen peroxide squirt and instructions. Though the kit doesn’t contain many parts, are there a lot of differences depending on where you buy them.

One difference is that a cheap over-the-counter whitening set has usually standard trays that are ready to use. The disadvantage of this type of tray is that it doesn’t fit completely to your mouth, which leads to a patchy result and the gel leaking to the mouth and gums. The leaking of the gel is not recommended and the gums can be whitened temporarily as well.

More expense whitening kits include trays that are boiled and moulded according to your mouth. Custom trays are important in order to assure decent whitening and consistency. It is pretty ascertain that custom tray will also decrease the gel leakage to the mouth and gums.