There are Many things that can render Tefillin or Mezuzah not Kosher or at best minimally Kosher.
Some of which happen over time with aging and some unfortunately are Posul from the get go.
Letters, words and or Tagim that are missing, extra substituted, touching, Broken, Improperly Spaced, misshapen faded, cracked and weather damaged.
We document the problems we find and periodically upload them to the website.
We hope that this will educate and encourage the public to purchase only Tefillin and Mezuzas that are high quality from a reputable source, to take care of them properly and have them checked regularly.
Tefillin need to be square, a dent in one of the corners can make them no longer Kosher. They do not have to be pointy on the corners, however if you, your son or husband have a serious dent like in the picture below, or if you are not sure how severe it is, bring them in right away to be inspected and if necessary fixed.
Sometimes nicks and dents can go undetected, which is one of the reasons why it is important to have Tefillin checked on a yearly basis. If that is not feasible then at least once every 5-7 years.
Remember; always handle Tefilin over a table or surface to prevent them from falling to the ground. It is also important to stay away from walls or low ceilings while wearing them.
Rabbi Kass was ordained by Rabbi Yisrael Meir Lau, former Ashkenazik Chief Rabbi of Israel. He is certified as a Sofer for both Kesivah and Hagoah by one of the leading experts in Safrus, Rabbi Avrohom Tzvi Vosner, Rav of the Vad Mishmeres Sta”m.