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Christine Till

Associate Professor

Research Interests

Dr. Till's research interests include children’s environmental health and understanding both protective and risk factors for cognitive decline following insult to the developing brain. Current work is focused on testing the effects of early-life exposure to fluoride on thyroid hormones and child neurodevelopmental outcomes. Her team works with three different population-based cohorts to understand how environmental chemicals are implicated as underlying risk factors for emerging morbidities in childhood, including ADHD. Her team has published several studies focused on the measurement of fluoride exposure in pregnancy, the endocrine-disrupting potential of fluoride, and the impact of fetal exposure to fluoride on child intellectual abilities and behavioural problems. Her research continues to attract the attention of policy-makers, scientists, advocates, media, and lawyers for its relevance to public health.


Department: Psychology
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Published Manuscripts (Select Publications)

Green R, Rubenstein J, Popoli R, Capulong R, Till C. Sex-specific neurotoxic effects of early-life exposure to fluoride: A review of the epidemiologic and animal literature. Current Epidemiology Reports. Accepted, 2020.

Till C & Green R. The evolving science of fluoride: When new evidence doesn’t conform with existing beliefs. Pediatric Research. Invited commentary for special issue on Controversies in Pediatrics, Accepted, 2020.

Till C, Green R, Flora D, Hornung R, Martinez-Mier EA, Blazer M, Farmus L, Ayotte P, Muckle G, Lanphear B. (2019). Fluoride exposure from infant formula and child IQ in a Canadian birth cohort, Environmental International, 134, January 2020, 105315,

Riddell J, Malin A, Flora D, McCague H, Till C. Association of water fluoride and urinary fluoride concentrations with attention deficit hyperactivity disorder in Canadian youth. (2019). Environment International, 133 (Part B),

Green R, Lanphear B, Hornung R, Flora D, Martinez-Mier A, Neufeld R, Ayotte P, Muckle G, Till C. (2019). Fluoride exposure during fetal development and intellectual abilities in a Canadian birth cohort, JAMA Pediatrics, 173(10), 940-948. doi:10.1001/jamapediatrics.2019.1729.

Till C, Dudani A, Cordoba L, Cano JC, Green R, Menezes-Filho JA, Smith D, Schnaas L, Lindh C, van Wendel de Joode B. (2019). The role of caregiving in infants' development in rural Costa Rica: Results from the Infant’s Environmental Health Study (ISA). Neurotoxicology, 74, 100-107.

Barlow-Krelina E, Turner GR, Akbar N, Banwell B, Lysenko M, Yeh EA., Narayanan S, Collins LD., Aubert-Broche B, & Till C. (2019). Enhanced recruitment during executive control processing in cognitively preserved patients with pediatric-onset multiple sclerosis. Journal of the International Neuropsychological Society, 25(4):432-442. doi: 10.1017/S135561771800125X.

Till C, Green R, Grundy JG, Hornung R, Neufeld R, Martinez-Mier A, Ayotte P, Muckle G, Lanphear. (2018). Community water fluoridation and urinary fluoride concentrations in a national sample of pregnant women in Canada, Environmental Health Perspectives, 126(10): 107001.

Bashash M, Merchand M, Hu H, Till C, Martinez-Mier AE, Sanchez BN, Basu N, Peterson K, Green R, Schnaas L, Mercado-Garcia A, Hernandez-Avila M, Tellez-Rojo MM. (2018). Prenatal fluoride exposure and attention deficit hyperactivity disorder (ADHD) symptoms in children at 6-12 years of age in Mexico City. Environmental International, 121(Pt 1):658-666. doi: 10.1016/j.envint.2018.09.017

Malin AJ, Riddell J, McCague H, Till C. (2018). The relationship among urinary fluoride, urinary iodine and serum thyroid stimulating hormone levels among adults living in Canada. Environment International, 121(Pt 1):667-674. doi: 10.1016/j.envint.2018.09.026