We suggest these marker uses, but you can use colors however they best work for you.
Sealant
Removable Prosthesis
Red X: Missing Tooth
Silver: Stainless Steel Crown
Blue: Amalgam Restoration
Red: Restoration Indicated
Pink: Endodontic Procedure
Orange: Glass Ionomer
Gold: Metal Crown/pontic
Blue Circle: Esthetic Crown/pontic
Green: Esthetic Restoration
Turquoise: Fixed Prosthesis
Blue Lines: Implant
Yellow Circle: Radiolucency
Black Circle: Radiopacity