Bait and Switch
I ordered two Dura Comfort 7x stronger and was sent two 4x stronger.  this doesn't sound like a big deal but it is.  the 7x stronger will last 6 months or more.  the 4x stronger I have had for 2 weeks and sadly im already biting through it.  if I had not been desperate I could have sent them back.  Frustrated.
Rating: 2 stars