Memory Game Healthy Teeth Memory MatchOnline version Dental Hygiene by Elizabeth Lowes Dentin Crown Dentist Hard outer layer of tooth Nerve Do this at least twice a day Cavity Can cause cavities Bottom part of tooth that is inside the gum Tongue Root Sensitive part of tooth Second layer of your tooth Visit every 6 months Enamel Brush Top half of tooth Sugar Brushing this to stop bad breath Hole in tooth