Historical clue formulations

• Tooth: Prefix — 2013-05-12
• Tooth: Prefix — 2012-05-06
• Tooth: Prefix — 2011-09-26
• Teeth: Prefix — 2000-06-04
• Tooth in front? — 1999-01-30
• Tooth: Prefix — 1995-07-23
• Tooth: Prefix — 1994-08-11