This study is a prospective, randomized, single-blind, split-mouth, national multicenter trial, comparing the efficacy of a self-etch adhesive system combined (SAM) with a flowable composite to that of a fluoride varnish for the prevention of spontaneous dental abscesses in children with XLH. For each patient, according to randomization, one side of the oral cavity is treated with the experimental treatment (application of the adhesive system to healthy anterior and posterior temporary teeth, and application of the flowable composite to healthy posterior temporary teeth), and the other side with the active comparator (fluoride varnish). The application process for both treatments is similar and will be renewed every 6 months (visits at 6, 12, 18 and 24 months) systematically for the SAM and the varnish, and in case of partial or total loss of the composite.
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presence of spontaneous dental abscesses
Timeframe: 24 month after inclusion