{"id":89823,"date":"2025-06-01T10:14:19","date_gmt":"2025-06-01T10:14:19","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89823"},"modified":"2025-06-01T10:14:19","modified_gmt":"2025-06-01T10:14:19","slug":"which-of-the-following-ions-present-in-low-concentration-in-drinking-w","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/","title":{"rendered":"Which of the following ions present in low concentration in drinking w"},"content":{"rendered":"

Which of the following ions present in low concentration in drinking water is essential for normal growth of teeth but harmful to teeth at high concentration ?<\/p>\n

[amp_mcq option1=”Aluminium” option2=”Calcium” option3=”Fluoride” option4=”Chloride” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2014<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe question describes an ion that is essential for normal growth of teeth in low concentration but harmful at high concentration. This perfectly describes the effect of fluoride ions on dental health.
\n– Aluminium: Not considered essential for teeth.
\n– Calcium: A major structural component of teeth and bones, essential in large amounts. While excess calcium intake can have health implications, its role in teeth is primarily structural, not a trace element with this specific low-dose benefit\/high-dose harm profile in drinking water.
\n– Fluoride: Fluoride ions are absorbed into tooth enamel, making it more resistant to acid attacks and preventing cavities. Low concentrations (typically 0.7-1.2 parts per million or ppm in drinking water) are beneficial for dental health. However, excessive fluoride intake, especially during tooth development, can lead to dental fluorosis (mottling and discoloration of enamel). Very high doses can cause skeletal fluorosis.
\n– Chloride: An essential electrolyte, but not known for this specific beneficial\/harmful effect on teeth development in drinking water.
\nTherefore, Fluoride is the ion that fits the description.
\n<\/section>\n
\nRecall the role of fluoride in dental health – beneficial at optimal low concentrations for strengthening enamel and preventing decay, but harmful at higher concentrations causing fluorosis.
\n<\/section>\n
\nWater fluoridation is a common public health measure to reduce dental cavities. The optimal level of fluoride in drinking water is a balance between preventing cavities and avoiding fluorosis. Natural fluoride levels vary widely depending on the geological source of water.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which of the following ions present in low concentration in drinking water is essential for normal growth of teeth but harmful to teeth at high concentration ? [amp_mcq option1=”Aluminium” option2=”Calcium” option3=”Fluoride” option4=”Chloride” correct=”option3″] This question was previously asked in UPSC CAPF – 2014 Download PDFAttempt Online The question describes an ion that is essential for … <\/p>\n

Detailed SolutionWhich of the following ions present in low concentration in drinking w<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1085],"tags":[1468,1117,1127],"class_list":["post-89823","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1468","tag-biology","tag-vitamins-and-nutrition","no-featured-image-padding"],"yoast_head":"\nWhich of the following ions present in low concentration in drinking w<\/title>\n<meta name=\"description\" content=\"The question describes an ion that is essential for normal growth of teeth in low concentration but harmful at high concentration. This perfectly describes the effect of fluoride ions on dental health. - Aluminium: Not considered essential for teeth. - Calcium: A major structural component of teeth and bones, essential in large amounts. While excess calcium intake can have health implications, its role in teeth is primarily structural, not a trace element with this specific low-dose benefit\/high-dose harm profile in drinking water. - Fluoride: Fluoride ions are absorbed into tooth enamel, making it more resistant to acid attacks and preventing cavities. Low concentrations (typically 0.7-1.2 parts per million or ppm in drinking water) are beneficial for dental health. However, excessive fluoride intake, especially during tooth development, can lead to dental fluorosis (mottling and discoloration of enamel). Very high doses can cause skeletal fluorosis. - Chloride: An essential electrolyte, but not known for this specific beneficial\/harmful effect on teeth development in drinking water. Therefore, Fluoride is the ion that fits the description. Recall the role of fluoride in dental health - beneficial at optimal low concentrations for strengthening enamel and preventing decay, but harmful at higher concentrations causing fluorosis.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which of the following ions present in low concentration in drinking w\" \/>\n<meta property=\"og:description\" content=\"The question describes an ion that is essential for normal growth of teeth in low concentration but harmful at high concentration. This perfectly describes the effect of fluoride ions on dental health. - Aluminium: Not considered essential for teeth. - Calcium: A major structural component of teeth and bones, essential in large amounts. While excess calcium intake can have health implications, its role in teeth is primarily structural, not a trace element with this specific low-dose benefit\/high-dose harm profile in drinking water. - Fluoride: Fluoride ions are absorbed into tooth enamel, making it more resistant to acid attacks and preventing cavities. Low concentrations (typically 0.7-1.2 parts per million or ppm in drinking water) are beneficial for dental health. However, excessive fluoride intake, especially during tooth development, can lead to dental fluorosis (mottling and discoloration of enamel). Very high doses can cause skeletal fluorosis. - Chloride: An essential electrolyte, but not known for this specific beneficial\/harmful effect on teeth development in drinking water. Therefore, Fluoride is the ion that fits the description. Recall the role of fluoride in dental health - beneficial at optimal low concentrations for strengthening enamel and preventing decay, but harmful at higher concentrations causing fluorosis.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:14:19+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which of the following ions present in low concentration in drinking w","description":"The question describes an ion that is essential for normal growth of teeth in low concentration but harmful at high concentration. This perfectly describes the effect of fluoride ions on dental health. - Aluminium: Not considered essential for teeth. - Calcium: A major structural component of teeth and bones, essential in large amounts. While excess calcium intake can have health implications, its role in teeth is primarily structural, not a trace element with this specific low-dose benefit\/high-dose harm profile in drinking water. - Fluoride: Fluoride ions are absorbed into tooth enamel, making it more resistant to acid attacks and preventing cavities. Low concentrations (typically 0.7-1.2 parts per million or ppm in drinking water) are beneficial for dental health. However, excessive fluoride intake, especially during tooth development, can lead to dental fluorosis (mottling and discoloration of enamel). Very high doses can cause skeletal fluorosis. - Chloride: An essential electrolyte, but not known for this specific beneficial\/harmful effect on teeth development in drinking water. Therefore, Fluoride is the ion that fits the description. Recall the role of fluoride in dental health - beneficial at optimal low concentrations for strengthening enamel and preventing decay, but harmful at higher concentrations causing fluorosis.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/","og_locale":"en_US","og_type":"article","og_title":"Which of the following ions present in low concentration in drinking w","og_description":"The question describes an ion that is essential for normal growth of teeth in low concentration but harmful at high concentration. This perfectly describes the effect of fluoride ions on dental health. - Aluminium: Not considered essential for teeth. - Calcium: A major structural component of teeth and bones, essential in large amounts. While excess calcium intake can have health implications, its role in teeth is primarily structural, not a trace element with this specific low-dose benefit\/high-dose harm profile in drinking water. - Fluoride: Fluoride ions are absorbed into tooth enamel, making it more resistant to acid attacks and preventing cavities. Low concentrations (typically 0.7-1.2 parts per million or ppm in drinking water) are beneficial for dental health. However, excessive fluoride intake, especially during tooth development, can lead to dental fluorosis (mottling and discoloration of enamel). Very high doses can cause skeletal fluorosis. - Chloride: An essential electrolyte, but not known for this specific beneficial\/harmful effect on teeth development in drinking water. Therefore, Fluoride is the ion that fits the description. Recall the role of fluoride in dental health - beneficial at optimal low concentrations for strengthening enamel and preventing decay, but harmful at higher concentrations causing fluorosis.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:14:19+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/","name":"Which of the following ions present in low concentration in drinking w","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:14:19+00:00","dateModified":"2025-06-01T10:14:19+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The question describes an ion that is essential for normal growth of teeth in low concentration but harmful at high concentration. This perfectly describes the effect of fluoride ions on dental health. - Aluminium: Not considered essential for teeth. - Calcium: A major structural component of teeth and bones, essential in large amounts. While excess calcium intake can have health implications, its role in teeth is primarily structural, not a trace element with this specific low-dose benefit\/high-dose harm profile in drinking water. - Fluoride: Fluoride ions are absorbed into tooth enamel, making it more resistant to acid attacks and preventing cavities. Low concentrations (typically 0.7-1.2 parts per million or ppm in drinking water) are beneficial for dental health. However, excessive fluoride intake, especially during tooth development, can lead to dental fluorosis (mottling and discoloration of enamel). Very high doses can cause skeletal fluorosis. - Chloride: An essential electrolyte, but not known for this specific beneficial\/harmful effect on teeth development in drinking water. Therefore, Fluoride is the ion that fits the description. Recall the role of fluoride in dental health - beneficial at optimal low concentrations for strengthening enamel and preventing decay, but harmful at higher concentrations causing fluorosis.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-ions-present-in-low-concentration-in-drinking-w\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CAPF","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-capf\/"},{"@type":"ListItem","position":3,"name":"Which of the following ions present in low concentration in drinking w"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/89823","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=89823"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/89823\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=89823"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=89823"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=89823"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}