Category Nuances for null:

• everyday,
• common,
• regular,
• home,
• commonplace,
• hygienic,
• preventive,
• basic,
• behavioural,
• routine,
• dental,
• healthy,
• limited,
• oral,
• mechanical,
• preventative,
• personal,
• ordinary,

Simple Categories for null:

• event,
• activity,
• procedure,
• pattern,
• care,
• intervention,
• thing,
• use,
• task,
• behavior,
• practice,