[Reduction of dental plaque by apples and chewing gum].

With aid of Plaque-Index (Quigley-Hein) the reduction of dental plaque was observed on 100 children per group: Tooth brushing for 2 min (first control group), Tooth brushing for 2 min combined with individual instruction and control of procedure (second control group), Eating an apple, Masticating chewing gum for 1 h. The following average reduction of dental plaque was find out: Group 1--0.42 grade of index (14.9%); group 2--1.00 (35.0%); group 3--0.47 (15.9%); group 4--0.28 (9.7%).