Summarize this article:

The Black Tooth Grin is typically served chilled or over ice. If you don't want yours that cold, skip the ice. For a stronger drink, use 2 ounces (60 milliliters) instead. You'll add the rest later. For a stronger drink, use 2 ounces (45 milliliters) instead. This will turn the drink its trademark dark color. The Black Tooth Grin is served as is, without any garnishes.

Summary:
Consider filling a shot glass with a few ice cubes. Fill the glass with 1 ounces (45 milliliters) of Crown Royal Canadian whisky. Add half the Coca-Cola. Pour in 1 ounces (45 milliliters) of Seagram's 7 whisky. Top off with the rest of the Coca-Cola. Serve.