Barium sulphate shows where food is trapped and over 80% of cavities occur inside grooves in chewing surfaces.

Plaque is easy to see at gum margins with food dye but few cavities occur where the the brushing removes plaque and saliva has easy access to neutralise acd and remineralise demineralised tooth.

Cavities occur where food is trapped on teeth and saliva has poor access like between teeth but over 80% of cavities occur inside pits and fissures where saliva has no access.

Fissure Sealants forced deep inside chewing surfaces, shows where food is trapped after the tooth is disolved in acid and where toothpaste can be forced before brushing.

Royal Nut Company, 


