Which straightening method combines use of a thio relaxer with flat ironing? lye based relaxer low pH relaxer hydrosxide relaxer Japanese therma straightening

## Step 1<br />The problem is asking us to identify the hair straightening method that combines the use of a thiourel relaxer with flat ironing. The options provided are lye-based relaxer, low pH relaxer, hydrosxide relaxer, and Japanese thermal straightening.<br /><br />## Step 2<br />The lye-based relaxer, low pH relaxer, and hydrosxide relax all relaxers that are used to straighten hair. However, they do not typically involve the use of a flat iron.<br /><br />## Step 3<br />On the other hand, Japanese thermal straightening is a method that combines the use of a relaxer with flat ironing. This method involves applying a relaxer to the hair, allowing it to sit for a certain amount of time, and then straightening the hair with a flat iron.