It is not very unhealthy to skip brushing your teeth for a single night. There is no significant difference between brushing your teeth on a particular night or not brushing your teeth on that night. It is very unhealthy to skip brushing your teeth every night. __________________________________________________________________________ There is no significant difference between being very unhealthy and not being very unhealthy.

Someone who does not brush their teeth on a particular night is not necessarily unhealthy. Someone who skips brushing their teeth for one night more than someone who is not unhealthy is also not necessarily unhealthy. __________________________________________________________________________ Therefore, someone who does not brush their teeth on any night is not necessarily unhealthy.

If we skip brushing our teeth tonight, then it's likely that we will skip brushing them tomorrow night. If we skip brushing our teeth tomorrow night, then it's likely that we will skip brushing them the night after tomorrow. If we skip brushing our teeth the night after tomorrow, then it's likely that we will skip brushing them the night after that. __________________________________________________________________________ Therefore, we should not skip brushing our teeth tonight.

None of the above.

All of the above.