When you are promoting a product that the consumer has not used yet, would you include or exclude the words between parentheses in the phrase below? I’m not a native English speaker, and the more I think it over, the more I start to doubt it. Google's results made me doubt even more. :) Would love to hear it from one of you experts to be 100% sure.
We are confident (that) this will be the best treatment you (have) ever experienced.
Thanks for your help!