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Repairs to the cabinet itself depends on whether the damage is structural – say, at a key location – or cosmetic, such as a door face or visible part of the cabinet carcass. Structural repairs are easiest when the wood is cracked, or split off.  If it’s a clean break, a little wood glue to repair the area stronger than the original document. If a piece is carved from, or the wood is broken after installation, you can often stuck in one of two ways :

• Create a new piece of the same size and type of wood, if possible, and mechanically fasten with dowels, screws, glue, or what means the most effective. Carpenters call this piece a replacement “Dutchman.”  A piece that’s slightly oversized can be sanded to match the original, and if the case is stained or painted a certain artistic retouching can do it all together and blend the repair almost invisible.
• Use an epoxy wood repair to the damaged area to fill, then sand and stain or paint to adjust. This material works amazingly well and the repair is often as strong as the wood. An additional advantage is that the epoxy filler is also waterproof so it can be used where the original wood damage was caused by wet conditions.

If the damage to an area that is clearly visible, it can be difficult for a “seamless” repair done. Small nicks and chips can be filled with plastic wood filler. It is sold in the colors of most wood stains game, and it is available in putty consistency or in wax-like sticks. Experiment mixing and color matching in an unseen area before a repair on a cabinet face