There can be a few variables

There can be a few variables involved, so you'd be best served by calling the help number on your product so they can collect all pertinent information and advise you accordingly.

It's not uncommon that teeth initially lighten unevenly due to the make up of the tooth internally. The biting-edge 1/2 of a front tooth may respond to whitening treatments more quickly because this aspect of the tooth is often almost entirely enamel.

The composition of the 1/2 of a tooth toward the gum line is one where an enamel layer covers over a darker center of dentin. This portion of the tooth may take longer to respond to the whitening treatments.

A common scenario is one where the biting-edge side of the tooth reaches a point where it lightens no further. Then due to continued treatments the gum-line portion tends to catch up in color.

Due to this anatomical difference, natural teeth frequently have some shade variation in these two regions. Bleaching treatments may or may not be able to overcome this and make a tooth entirely uniform in color.

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