Purchase a Zing Bar at Rite Aid or Walgreens and submit your receipt to get 100% of the purchase price back.

Walgreens has Crest 3D White Toothpaste for $3. Buy 2 and get $3 in Walgreens Cash.  Use the $3.00/2 Crest and/or Oral-B Walgreens digital coupon to make it free.

Walgreens has Crest Toothpaste and Oral-B Manual Toothbrush for $3 each.
Use the $3.00/2 Crest or Oral-B Dental Care products digital coupon
You get $3 Walgreeens Cash when you buy 2 to make them free.

Walgreens has Crest Toothpaste for $3.29. Buy 3 and use the $5 off 3 Crest digital coupon. You get $5 in Walgreens cash when you buy 3, to make it free.