Extrusion

 Extrusion is the process whereby teeth are pulled futher out of the gum, though not removed. 

Enamel

 Enamel is a ceramic which forms the outer part of the tooth. Enamel is the toughest material in the human body.

Distal

 A technical term that means "behind" or "to the back of". Your back teeth are distal to your front teeth.

Dentin

 Dentin is the part of the tooth below the enamel that is made from calcium. It contains the root canal and pulp chamber.

Dental Hygienist

 A dental hygienist is a dental profeesional primarily concerned with the cleaning of teeth.

Decay

 The process whereby teeth gradually disintegrate due to poor oral hygiene and/or disease.

Decalcification

 This term refers to the loss of calcium from teeth, that leaves them susceptible to decay.

Cap

 An alternative term for a crown.

Calcification

 A process where tissues are hardened through the build up of calcium and phosphorous salt deposits.

Lidocaine

 Lidocaine is a common anaesthetic used for dental treatment.