Spending $40 on participating Colgate-family items at Amazon takes $10 off, which works out to 25% off a $40 order. The discount applies across the whole group, so toothpaste, toothbrushes, mouthwash, and hand soap can be combined to reach the $40 threshold, through Sept.

30. Only items sold by Amazon.com or Amazon.com Services LLC qualify, so third-party seller listings don't count toward the total.

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