Repair bookcase that B's chewed on??

My two B's never used to chew on wood furniture, but for some reason they are chewing on the edges of a bookcase. The case is made of particle board. Does anyone have any suggestions on how to repair the chewed-on corners?

Thanks.

In many shops you can buy special repair kits (although, in holland you can) lot of choise between colours.
Many different materials also, from brown pencils, to special wood gummy..

Our Chafuko did the same as a puppy, he chewed on our little table.
Only on that little table (amost everyting else is wood) we just said very loud "chafuko No!" After a little while he just stopped.

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