Candle care is an important part of owning a wooden wick candle. All wicks must be kept to a height of approximately 1/8". Prior to each light, the burnt part of the wick should be trimmed off, as this increases soot and smoke, as well as increases the height of the flame which can become dangerous. 

These wick trimmers are designed to reach into vessels of all shapes and sizes and trim until the very last light.