Declare @myString Varchar(256)

SET @MY STRING = 'A COSMETOLOGIST uses knowledge to do things to a client`s hair. A HAIRAPIST uses knowledge to give a customer guidance so she can do her own "hair improvement".

there is 4 spaces after "HAIRAPIST", the replace would change from 4 spaces to two spaces, so it's misleading because there is still more whitespace than you expect to be there when you are done.

Hate to think a loop should be used, most likely a tally table solution would help strip out doubler spaces;

lemme try something and i'll post the results.