Rav Moshe Shternbuch - Garlic & Sharp Foods on Pesach
There is a minhag not to eat garlic on Pesach. Rav Moshe Shternbuch (5:127:10) say that for dry garlic there is grounds to be machmir. He explains that most people have fillings, crowns, and other dental implants in their mouths that absorb chometz all year. In order to make sure they do not make the food we chometz one should not eat hot food for 24 hours before Pesach. This would render any taste emanating from the pre absorbed chometz spoiled (Nosein Ta'am Lifgam) and would not make the food we eat on Pesach chometz.
This however does not help for sharp foods which can become chometz even from things absorbed over 24 hours prior. This combined with the pressure of the tooth cutting the food (Duchka D'Sakina) negates the heter of Nosein Ta'am Lifgam. Because of this says Rav Shternbuch it is wise to refrain from eating any sharp foods the entire Pesach.
Important Note: We bring this tshuvah as a starting point for discussion and not to convey any halacha. We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. One should learn the tshuva to verify the accuracy of our interpretation. Please understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.