DENTES BRANCOS
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Desejar um sorriso de estrela de cinema—já que as celebridades estão todas “clareadas”—pode custar caro não mais ao bolso, mas à saúde da boca.
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Muita gente está sorrindo amarelo mesmo com dentes alvos. O aperfeiçoamento e a conseqüente popularização das técnicas de clareamento dental tornaram o procedimento comum nos consultórios. Isso somado a preços mais acessíveis—há 10 anos, o tratamento inicial, com média de três sessões, custava cerca de R$ 2.000; hoje, caiu para R$ 1.200—contribuíram para a coqueluche do branqueamento. E também para os exageros. É que além de tornar os dentes reluzentes (por vezes com aparência artificial), cargas excessivas de substâncias clareadoras podem deixá-los mais sensíveis e predispostos ao acúmulo de placa bacteriana. Seja qual for o método escolhido, caseiro ou a laser, a participação do dentista é fundamental para o processo. Somente ele pode avaliar o grau seguro de clareamento, já que cada pessoa tem um limite. “Não se pode ultrapassar a tolerância biológica de cada um. Forçar a barra pode causar um dano irreversível na estrutura do dente”, diz o dentista Luís Roberto Marcondes Martins, professor de dentística restauradora da Faculdade de Odontologia de Piracicaba-Unicamp. “Mesmo os tratamentos caseiros têm de ser monitorados. A aplicação é feita em casa, mas o paciente tem de freqüentar o consultório”. Trocando em miúdos, não dá para levar uma revista ao dentista e pedir o sorriso igualzinho ao daquela atriz. Se a genética não for a mesma—e o profissional, competente—na melhor das hipóteses pode ficar apenas parecido. Tanto no clareamento caseiro (feito com moldes de silicone e gel de perióxido de carbamida) quanto no aplicado em consultório (com perióxido de hidrogênio ativado pelo laser)—o princípio ativo utilizado é baseado em água oxigenada (H2O2), a mesma utilizada para transformar morenas em loiras platinadas. Isso significa que ocorre uma reação química no dente: liberado, o oxigênio fragmenta e expulsa as moléculas de pigmentação. O efeito, além do clareamento, é uma maior porosidade do dente, tornando-o, portanto, mais sensível. Não respeitar um intervalo entre as sessões de clareamento pode ser agressivo ao esmalte, que precisa de tempo para se recompor. “Depois do processo de branqueamento, demora pelo menos seis meses para que o dente recupere sua composição original”, explica o dentista. A sensibilidade local (tratada com medidas paliativas, como aplicação de flúor), irregularidades na superfície do dente e problemas na gengiva também são decorrentes no exagero de substâncias branqueadoras. Insatisfeita com a cor dos dentes e diante da recusa da dentista em prolongar o tratamento a laser, a arquiteta R. R., 30, comprou as bisnagas de gel clareador e fez ela mesma sessões extras em casa com um molde que já possuía. “Eu era viciada em clarear o dente, nunca parecia branco o suficiente, mesmo meus amigos dizendo que já estava ficando feio”, conta. “Mas comecei a sentir dores horríveis por causa da sensibilidade e parei com isso, pelo menos por um tempo”. De acordo com Martins, a estética é hoje uma vertente muito forte na odontologia, principalmente pela valorização social da beleza. “Estamos em uma fase de culto ao belo e o sorriso está dentro desse conceito”, diz o dentista. “O clareamento de dentes é um tratamento interessante, seguro e válido, mas exageros trazem prejuízos”.
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PASTA CLAREIA?
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Pastas de dente com função clareadora são levemente abrasivas e, portanto, indicadas para remover pequenas manchas e amarelamentos. “As pastas de venda livre têm um sistema branqueador suave, mais indicado para disfarçar ou maquiar”, explica o farmacêutico-bioquímico Jadir Nunes, especialista em cosmetologia na área de higiene oral e presidente da Associação Brasileira de Cosmetologia. “Não tem o mesmo resultado do clareamento feito no consultório, mas podem ser usadas para manutenção, para evitar que o dente volte a manchar”, conclui. אַ
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[extraído da Revista da Folha de 03/06/2007, p.20-21]
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