My friends dd was the same too she was 18 months before she got a tooth
She did take her to a dr cause she was coping all the same remarks but he said they will come wen they are ready u can't force them but she did go in case something was happening...
I would trust ur own instincts but Mayb get him checked jus to ba able to put these ppl in their place n that way u will also not 2nd guess urself iykwim??