Do we have the complete Torah from the Dead Sea Scrolls? If not, how can we know for sure that the Torah we have today is the same from the time of the Second Temple Period, for example?
"No complete proto-MT scrolls have been found; just partial scrolls and fragments. Thus, only a very small percentage of the proto-MT biblical text has survived, possibly five percent. Nevertheless, since the surviving texts are virtually identical with the medieval MT, we believe that the non-extant portions of proto-MT would have been identical with the consonants of the medieval text."