224 THE WONDERFUL HOUSE THAT JACK HAS 



and physicians to understand ! On the contrary, the 

 causes are very simple. The protective covering, 

 enamel, is largely composed of lime and other minerals 

 that dissolve in acid. Food decaying in the mouth 

 produces acid that dissolves some of the enamel with 

 which it comes in contact, thus laying the weaker 

 dentine open to similar attacks. 



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Temporary and permanent teeth. 



Knowing these facts, it is certainly plain that we 

 should thoroughly clean our teeth after each meal, or, 

 if this is not possible, at least once a day. If only one 

 cleaning a day is convenient, just before going to bed 

 at night is the best time. The following is an excellent 

 way. Rinse the mouth with water, using the tongue and 

 muscles of the face to force the cleansing liquid about. 

 Next crowd dental floss (waxed silk thread) between 



