Cosmetics Formulation Development

I tried to formulate a child's mouthwash using Cooling Agent 3 types (food grade) 1. WS-23 Cooling Agent s 2. WS-3 Cooling Agent s 3. WS-12 Cooling Agent s The results showed that after rinsing, there was toothache, sore gums, the symptoms persisted for about 15 minutes and then disappeared. I'm not sure what caused it. The ratio used for Cooling Agent is 0.3%, is there any solution?

Hello, should have to reduce the usage rate because it may be too cold.