Severe dental pain is usually caused by an underlying infection, and antibiotics alone may not resolve the problem without proper dental treatment. While other antibiotics may be used in some cases, the choice depends on the type of infection and your health condition. It is not advisable to change or start antibiotics on your own, as incorrect use may lead to poor response or resistance. You should consult a dentist for proper evaluation and treatment, and in the meantime, use pain relief as advised and avoid chewing on the affected side.