Objective: How to properly brush your teeth.

Which of the following solutions is more sound in terms of naive physics reasoning?

Possible answers:
a). Add toothpaste to your toothbrush. Angle your toothbrush 45 degrees from gums. Roughly move your toothbrush in circular motion. Repeat on inside surfaces. Spit out the tootpaste after brushing and rinse mouth with water.;
b). Add toothpaste to your toothbrush. Angle your toothbrush 45 degrees from gums. Gently move your toothbrush in circular motion. Repeat on inside surfaces. Spit out the tootpaste after brushing and rinse mouth with water.;
b).