First time parent and first time poster! Our four month old has been showing signs of teething and at the suggestion of the health visitor I tried some teething gel (anbesol) for the first time. I then saw online that some teething gels can cause an allergic reaction - though this is very rare. Baby has fallen asleep almost straight away after applying it but I wish I hadn’t applied at night for the first time. Would any reaction be almost instant or do I need to watch over him? He pulled a funny face and coughed a bit when I applied it but I assume that’s due to the very unusual taste and sensation.