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