Is my mister twister knife blade dull?

Mister Twister RB-1209 EF Replacement Blade, 9-Inch 1-Pack : Tools & Home Improvement

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The Mister Twister Replacement Blade Electric Knife RB-1201 has an extra sharp stainless-steel blade for fast and easy filleting. Blade fits both the

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The cutting edge on fillet knives