And you too shall blunt his teeth

The word שיניו (teeth) can also allude to the letter Shin. The Frierdike Rebbe said that this means that we should take out the “Shin” from the Rasha. Kabbalah teaches that some letters of the Alef Beis are “good”, and some are “bad”. Shin is one of the holy letters. The Haggadah is telling us to take out the Shin – the spark of good within the רשע, so that all that will remain is רע - the bad. As is known, Kelipah doesn’t have a real existence, it draws life from its holy spark. When this is taken out, the bad will cease to exist.

~ Second night Seder 5699