Category Nuances for null:

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

Simple Categories for null:

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