Dental-care startup Toothsi has raised $20 million in a Series B funding round led by Eight Roads Ventures, Think Investments and the Mankekar Family Office. Blackrock Asia’s vice president Vishal Agrawal, Pharmeasy co-founders Siddharth Shah and Dharmil Sheth, Livspace cofounder Ramakant Sharma and Karan Singh of Bain & Co. India also participated in the round.…