Which one of the following oral hygiene products is the least effective in removing plaque from between tooth contact points?

The least effective oral hygiene product for removing plaque from between tooth contact points is the woodstick. While woodsticks can help in cleaning around teeth and may remove food particles, they are not designed to effectively disrupt and remove plaque within the tight spaces between teeth.

Floss, interdental brushes, and tape are specifically designed for interdental cleaning. Floss can stretch and conform to tooth contours, effectively reaching plaque and debris between teeth. Interdental brushes are also particularly efficient as they come in various sizes to accommodate different gaps, allowing for thorough cleaning. Tape functions similarly to floss but is broader and can provide more surface area for plaque removal in wider spaces.

In contrast, woodsticks lack the flexibility and efficiency needed to effectively dislodge plaque from these critical contact points, making them the least effective option in this context.