Crest ProHealth Toothpaste Review

I have been recommended to use Crest toothpaste by my dentist and his associates.  Of all of the different kinds of toothpast that Crest makes, he told me that I should use the Cavity Fighter one.  I am 80 years old and I am told by me dentist that your teeth should last a life time.  I am doing my best to see that that is true.  When you go into the store there are several different kinds of Crest.  There is  a night Crest and a day Crest, I can't for the life of me figure that one out.  You are spending money for two tubes; but, it will take twice as only to use them up.  Go figure.  There may be a reason; but, as of now, my dentist has not told me I need this.  Sometimes, I accidentily get home with a tube of the gel.  I ask the dentist if this was alright to use.  He said that I would be better off if I did not, as it was very abrasive.  That may be because of my age; but, I would think that that would give anyone cause to pause and think about it.  I wish that Crest would make their packaging more distinctive so that one could easily find the kind that was best for them.