How do cavities get fixed in the front teeth without being noticeable?

Composite fillings: In the hands of a skilled dentist, teeth damaged by dental caries (cavities) can be restored with the use of tooth colored bonded composite fillings to be practically undetectable if not 'invisible'. When there is extensive damage to the tooth, a tooth colored ceramic crown can better protect and restore the tooth to match your natural teeth as well.

Bonded restorations: Tooth colored fillings can be used to restore cavities in those anterior teeth. The composite material comes in many shades, and your dentist will match the color to your own tooth. If the tooth is severely damaged, then porcelain restorations can be used, and the same color matching applies.