Possible Clues:

• Bucky Beaver's toothpaste
• Classic toothpaste brand
• "Brusha, brusha, brusha" toothpaste
• Toothpaste promoted by Bucky Beaver
• Toothpaste brand of old
• Old Colgate rival
• Classic toothpaste name
• Classic toothpaste
• Bucky Beaver's brand
• Old Colgate competitor