Dr Tosha Ashish Kalhan

Dr Tosha is a dentist with over 11 years of experience in population health research. She obtained her MSc (2015-2016) and PhD (2016-2020) from Faculty of Dentistry, National University of Singapore, where she worked extensively with the GUSTO birth cohort study, one of Asia’s largest longitudinal birth cohorts, focusing on early-life determinants of oral health and improving oral health outcomes in Singaporean children.

After completing her PhD, she worked as a Research Fellow at the Saw Swee Hock School of Public Health (2021–2025), where her research was related to chronic disease prevention in older adults, with a focus on diabetes-related complications and cardiovascular disease in ageing populations. During this period, she has led and co-authored high-impact publications and contributed to multiple national-level projects leveraging administrative health data from the Singapore’s Ministry of Health to generate evidence for cost-effective, population-level health policy.

In November 2025, Dr Tosha joined the National Dental Centre Singapore, where her research focusses on sugar reduction policies and their impact on child’s oral and systemic health outcomes, as part of the NMRC-STAR grant led by Prof Marco Peres.

• Doctor of Philosophy (PhD), National University of Singapore, Singapore, 2021
• Master of Science (MSc), National University of Singapore, Singapore, 2016
• Bachelor of Dental Surgery (BDS), Gujarat University, India, 2009 

• NUS Research Scholarship, 2016-2020

1. Kalhan AC, Kalhan TA, Peres MA, Leite FR, Nascimento GG. Diet Quality as a Mediator Linking Tooth Loss and Cardiovascular Diseases in Older Adults. J Periodontal Res. 2026 Feb 26. doi: 10.1111/jre.70080. Epub ahead of print. PMID: 41755532. JIF: 3.4.

2. Kalhan TA, Luo M, Chai JH, Tai ES, Lim SC, Coffman TM, Venkataraman K. Health economic evaluation of a risk-stratified intervention in diabetic kidney disease. Diabetologia. 2025 Oct;68(10):2227-2239. JIF: 10.2.

3. Chen Y, Torta F, Koh HWL, Benke PI, Gurung RL, Liu JJ, Ang K, Shao YM, Chan GC, Choo JC, Ching J, Kovalik JP, Kalhan T, Dorajoo R, Khor CC, Li Y, Tang WE, Seah DEJ, Sabanayagam C, Sobota RM, Venkataraman K, Coffman T, Wenk MR, Sim X, Lim SC, Tai ES. Metabolomics profiling in multi-ancestral individuals with type 2 diabetes in Singapore identified metabolites associated with renal function decline. Diabetologia. 2025 Mar;68(3):557-575. JIF: 10.2.

4. Kalhan AC, Kalhan TA, Romandini M, Bitencourt FV, Cooray UMP, Leite FRM, Nascimento GG. Insulin resistance and periodontitis: Mediation by blood pressure. J Periodontal Res. 2025 Mar;60(3):226-235. JIF: 3.4.

5. Kalhan TA, Loo EXL, Shek LP, Kramer MS, Un Lam C, Karunakaran B, Van Bever H, Goh A, Chong YS, Lee BW, Tan KH, Saw SM, Godfrey KM, Stephen Hsu CY. Evaluation of caregiver-reported criteria for diagnosing eczema in young children. Pediatr Allergy Immunol. 2022 Jan;33(1):e13675. JIF: 4.5

6. Kalhan TA, Un Lam C, Karunakaran B, Chay PL, Chng CK, Nair R, Lee YS, Fong MCF, Chong YS, Kwek K, Saw SM, Shek L, Yap F, Tan KH, Godfrey KM, Huang J, Hsu CS. Caries Risk Prediction Models in a Medical Health Care Setting. J Dent Res. 2020 Jul;99(7):787-796. JIF: 5.9.

7. Kalhan TA, Lin YT, Kalhan AC, Lin YJ, Chou CC, Hsu CS. Dental plaque pH in predicting caries relapse after general anaesthesia - an exploratory study. Int Dent J. 2019 Dec;69(6):419-427. JIF: 3.7.

8. Lin YT, Kalhan AC, Lin YJ, Kalhan TA, Chou CC, Gao XL, Hsu CS. Risk assessment models to predict caries recurrence after oral rehabilitation under general anaesthesia: a pilot study. Int Dent J. 2018 Dec;68(6):378-385. JIF: 3.7.

9. Kalhan TA, Loo EXL, Kalhan AC, Kramer MS, Karunakaran B, Un Lam C, Van Bever H, Shek LP, Goh A, Chong YS, Lee BW, Gluckman P, Kwek K, Saw SM, Godfrey K, Hsu CY. Atopic dermatitis and early childhood caries: Results of the GUSTO study. J Allergy Clin Immunol. 2017 Jun;139(6):2000-2003. JIF: 11.2.