from about 75% to about 90% by {TAIL ~ weight} of {HEAD ~ a mixture} of at least two abrasive powders comprising at least 50% by weight of calcium carbonate 
from about 75 % to about 90 % by { TAIL ~ weight } of { HEAD ~ a mixture } of at least two abrasive powders comprising at least 50 % by weight of calcium carbonate
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH