Chalk (sidewalk, blackboard) is made of calcium salts and is not harmful in unintentional ingestions.
- Possible upset stomach (discomfort, nausea, isolated episode of vomiting or diarrhea).
- Provide something to drink for dilution.
- If you have questions, call the Poison Centre.
- Every case is different. OPC is available 24hrs/day to provide information for your individual situation. Call 1-800-268-9017 (Toll-free) or 416-813-5900 (Local).